B. Foundations of Language · Foundations: Speaking, Listening, Words and FluencySuffix Chains and Greek Endings: -ologist, -graphy, -meter, -cide, -phobia
B2.1 B2.2 A3.1About 45 minutes
Learning goals- I can read long words with several suffixes by peeling them from the end.
- I can explain how each suffix in a chain changes a word's part of speech and meaning.
- I can use the Greek endings -ology/-ologist, -graphy, -meter/-metry, -cide and -phobia/-phobic to understand subject words.
- I can hear where the stress falls in long words and read them smoothly.
Words to know
suffix
A word part added to the end of a base; it can change the meaning or the part of speech.
suffix chain
Two or more suffixes added one after another: nation + al + ize + ation.
part of speech
A word's job in a sentence, such as noun, verb, adjective or adverb.
combining form
A Greek or Latin word part, like -ology or -meter, that joins with other parts to make a word.
stress
The syllable said with the most force, like GUIN in pen-GUIN.
Remember from earlier grades
You know many suffixes: -ful, -less, -ment, -tion, -ous, -ive, -ity (earlier grades), -ance/-ence, -ic, -ify, -ship (Grade 5) and -ist, -ian, -ize, -ory, -ical, -cy (Grade 6). You learned that suffixes can shift stress (PHO-to-graph, pho-TOG-ra-pher) and change spelling (decide, decision). You also met -logy (the study of) in Grade 5. In Grade 7 you'll read words with suffix chains, and learn more Greek endings that build hundreds of science and social studies words.
Let's start with a giant word
Read this: institutionalization.
Scary? Peel it from the end, one suffix at a time:
- institutionalization → institutionalize (verb)
- institutionalize → institutional (adjective)
- institutional → institution (noun)
- institution → institute (verb or noun)
Now build it back up: in·sti·tu·tion·al·i·za·tion. Eight syllables, but each piece is one you already know.
Suffix chains change the job of a word
Many suffixes change a word's part of speech. When you add several, the word keeps switching jobs:
- nation (noun) → nation·al (adjective) → nation·al·ize (verb) → nation·al·iz·ation (noun)
- hope (noun or verb) → hope·ful (adjective) → hope·ful·ly (adverb)
- predict (verb) → predict·able (adjective) → un·predict·abil·ity (noun)
Notice small spelling changes at the joins: the e in activate drops before -ion (activation), -able becomes -abil- before -ity. (Spelling rules for joining suffixes are practised in the Foundations of Writing unit.)
| Greek ending | Means | Examples |
|---|
| -ology / -ologist | the study of / a person who studies | biology (life), geology (earth), ecology (eco = house, home: living things and their environment), geologist, biologist |
| -graphy | writing, drawing, recording | geography (writing about the earth), biography (the written story of a life), choreography (writing down dance steps) |
| -meter / -metry | measure / measuring | thermometer (therm = heat), barometer (air pressure), speedometer; geometry (earth measuring) |
| -cide | kill, killer (Latin) | pesticide (kills pests), herbicide (kills plants such as weeds), insecticide, fungicide |
| -phobia / -phobic | fear of; (in science) avoiding or repelling | claustrophobia (fear of closed-in spaces), arachnophobia (fear of spiders), hydrophobic (water-repelling: water beads up on wax) |
Stress patterns help you read
These endings have predictable stress, which helps you read them smoothly:
- -ology words stress the OL: biOLogy, geOLogy, ecOLogy.
- -graphy words stress the syllable before graph: geOGraphy, biOGraphy, phoTOGraphy.
- -meter words that name instruments often stress the syllable before meter: therMOMeter, baROMeter.
A Canadian spelling note
In Canada, the unit of length is spelled metre (kilometre, centimetre), but a measuring device is spelled meter (thermometer, speedometer, parking meter). Same Greek root, two spellings, two jobs.
Worked exampleLet's read and define three subject words
Read these words from science and social studies texts: seismologist, cartography, herbicides.
- seismologist: peel -ologist = a person who studies. Seism comes from a Greek word for shaking (think earthquake). So a seismologist is a scientist who studies earthquakes. Stress: seisMOLogist.
- cartography: peel -graphy = writing, drawing. Carto comes from a word for map or chart. So cartography is the drawing of maps. Stress: carTOGraphy. A person who does it is a cartographer.
- herbicides: peel -s (plural), then -cide = kills. Herbi = plant (as in herbivore, a plant-eater). So herbicides are chemicals that kill plants, usually weeds.
- Check in context: Farmers sometimes spray herbicides to control weeds in their fields. The meaning fits.
seismologist = a scientist who studies earthquakes; cartography = map-making; herbicides = chemicals that kill unwanted plants.
Just for funFun fact: There's a jokey word for the fear of long words: hippopotomonstrosesquippedaliophobia. It's 36 letters long, which is either very funny or very mean.
Peel from the end
With suffix chains, start at the end: take off one suffix, say what's left, and keep going until you reach the base. Then build it back up out loud.
Hands-on activitySuffix ladder race
You need: paper, a pencil and a timer. A dictionary (paper or online) for checking.
- Write these starting words at the bottom of separate 'ladders': nation, act, form, hope, create, person.
- For each, climb the ladder by adding one suffix at a time to make a new real word. Label each rung with its part of speech. Example: form (verb) → formal (adjective) → formalize (verb) → formalization (noun).
- Give yourself 5 minutes. Count your rungs.
- Check any word you're not sure of in a dictionary.
- Then look through a science textbook, a weather app or a newspaper for words ending in -ology, -graphy, -meter, -cide or -phobia. Write three and their meanings.
What to look for: real words, correct part-of-speech labels, and correct spelling changes at the joins (create → creative → creativity; person → personal → personality).
Your turn
1Peel nationalization from the end. List each word you get.
nationalization → nationalize → national → nation.
2What part of speech does -ly usually make? Example: hopefully.
3What does a geologist study?
The earth (rocks, minerals, landforms); geo = earth, -ologist = a person who studies.
4What does a thermometer measure?
Heat / temperature. Therm = heat, -meter = measure.
5Use the ending to explain insecticide.
Insect + -cide (kill): a substance that kills insects.
6Where is the stress in biology?
7Which spelling is correct in Canada for the unit: metre or meter? And for the instrument in your car that shows speed?
Unit: metre. Instrument: speedometer (-meter).
More practice: warm-up
Writing, drawing or recording.
3Name one word ending in -meter.
Examples: thermometer, barometer, speedometer.
5Add one suffix to hope to make an adjective.
More practice: on your own
1Build a suffix chain from create with at least three words and label each part of speech.
Example: create (verb) → creative (adjective) → creatively (adverb), or creative → creativity (noun).
2Is a biography written by the person it's about? Use the word parts and explain.
Not usually. Bio = life, -graphy = writing: it's writing about a person's life, usually by someone else. (A life story written by the person themself is an autobiography: auto = self.)
3Wax is hydrophobic. What would you see if you dripped water on a waxed surface? Explain with the word parts.
The water would bead up instead of soaking in. Hydro = water, -phobic (in science) = repelling or avoiding.
4Mark the stress: geography, photography.
ge-OG-ra-phy; pho-TOG-ra-phy.
5What spelling change happens when you add -ion to activate?
The silent e is dropped: activate → activation.
Challenge
1Peel unpredictability completely and explain how each part adds to the meaning.
un- (not) + pre- (before) + dict (say) + -able (can be; becomes -abil-) + -ity (the quality of). Together: the quality of not being able to be told in advance, for example, the unpredictability of spring weather.
2A dendrologist studies trees, and dendr means tree. Using that, what might dendrochronology be? (Hint: chron = time.)
The study of tree time: dating events or a tree's age by studying tree rings. (dendro = tree, chron = time, -ology = study of.)
3Explain why knowing -cide helps you understand news about farming and the environment.
Words like pesticide, herbicide, insecticide and fungicide appear often in farming and environment news. Knowing -cide = kill tells you each is a substance that kills a certain living thing, so you can follow the article even if you haven't seen the exact word before.
Quiz
1. What part of speech is nationalize?
3. Which word means chemicals that kill plants (such as weeds)?
4. Where is the stress in thermometer?
5. What is the best first step to read environmentalists?
6. In Canadian spelling, which is correct?
Big idea (B2.1, B2.2, A3.1): Grade 7 students use generalized knowledge of morphemes to read complex words accurately and automatically and to understand new words in other subjects. This lesson focuses on suffix chains (which change a word's part of speech) and Greek and Latin endings common in science and social studies.
How to help at home:
- When you see a long word on a label or in the news, peel it from the end together.
- Point out -ology, -graphy and -meter words in weather reports, museums and documentaries.
- Play "suffix ladder" while waiting in line or in the car.
Common difficulties:
- Losing track in long words. Write the word and draw a line between each suffix.
- Spelling changes at the joins (dropping e, -able to -abil-). These are practised in the Foundations of Writing unit.
- Mixing up metre and meter. Remember: units are -metre in Canada; devices are -meter.