B. Foundations of Language · Spelling, Grammar and Punctuation

Greek Word Parts for Science: Air, Sailors, Power, Universe and Together

B2.1 B2.2 A3.1About 45 minutes

Learning goals

I can tell the meaning of Greek word parts like aero, naut, dynam, cosm, syn/sym, path, chlor and phyll.
I can spell science words by building them from Greek parts.
I can use Greek spelling clues (ph for /f/, ch for /k/, y for /i/) to spell new words.
I can explain how Greek parts help me understand Grade 6 science topics like flight, space and biodiversity.

Words to know

Greek word part
A morpheme that comes from ancient Greek, often found in science and math words.

combining form
A word part, like aero or photo, that joins with others to make a word.

compound word part
Two word parts joined together, like astro + naut.

Remember from Grades 4 and 5

You know Greek parts like tele (far), graph (write), phon (sound), scope (look), micro (small), bio (life), geo (earth), therm (heat), photo (light), hydro (water), chron (time), astro (star), cycl (circle) and logy (study of). You also know Greek spelling clues: ph says /f/, ch can say /k/, and y can say /i/.

Grade 6 science includes flight, space, biodiversity and electricity. Many of the words in these topics are built from Greek parts. Let's learn some new ones.

Greek part	Means	Examples
aero	air	aerial, aerospace, aerodynamic
naut	sailor, ship	astronaut, nautical
dynam	power, force	dynamic, dynamite, aerodynamic
cosm	universe, order	cosmos, cosmic, cosmonaut
syn, sym	together, same	synonym, symmetry, sympathy, photosynthesis
path	feeling; also suffering or disease	sympathy, empathy, pathologist
chlor	green	chlorophyll, chloroplast
phyll	leaf	chlorophyll

Eight Greek word parts for Grade 6

Putting parts together

astronaut = astro (star) + naut (sailor): a star sailor.
aerodynamic = aero (air) + dynam (power, force) + -ic: shaped to move smoothly through the air, like a wing or a bird's body.
chlorophyll = chlor (green) + phyll (leaf): the green substance in leaves that captures light energy.
photosynthesis = photo (light) + syn (together) + thesis (putting): putting together with light. Plants use light energy to make food.
symmetry = sym (same) + metr (measure) + -y: the same measure on both sides. You use this word in math!

Greek parts snap together like building blocks. Add up the meanings: an astronaut is a star sailor, and a cosmonaut sails the universe.

Spelling clues from Greek

ph says /f/: chlorophyll, photosynthesis, symphony.
ch can say /k/: chlorophyll, chrono.
y can say /i/ in the middle of a word: symmetry, synonym, chlorophyll.
syn becomes sym before b, m and p: symmetry, sympathy, symbol, symphony. (It's a chameleon part, like the Latin prefixes you met in Grade 5!)

Worked example

Let's spell a science word from its parts

A scientist who studies diseases to find out what causes them is called a path-o-log-ist. Spell it using Greek parts.

Listen for the parts: path (disease) + o (connecting vowel) + logy (study of) + -ist (person who).
path is spelled with th.
logy changes to log before -ist: log + ist.
Put it together: path + o + log + ist.

pathologist

Worked example

Let's use Greek parts to explain a word

Explain sympathy and empathy. How are they related?

sympathy = sym (together, same) + path (feeling) + -y: feeling together with someone, like feeling sorry that they're sad.
empathy = em (in) + path (feeling) + -y: feeling in someone else's position, understanding how they feel from the inside.
Both share the root path (feeling), so both are about feelings.

Both words use path (feeling). Sympathy = feeling together with someone; empathy = understanding a feeling as if you were in their place.

A Greek word sum. The boxes are green, just like chlorophyll, which gives leaves their green colour.

Just for fun

What if you invented a job using Greek-style parts? Someone who sails through a giant bowl of spaghetti could be a pastanaut. It's not a real word, but now you know exactly how words like astronaut get built!

Hands-on activity

Greek word part science hunt

You need: paper, a pencil, and a science book, a library book about flight or space, or a children's science website a grown-up has checked.

Make a chart with three columns: Word, Greek parts, Meaning.
Find at least six words that use any Greek part you know (old or new). Look for words about flight, space, plants or electricity.
Write each word sum, like aero + space.
Invent a new word from Greek parts for a made-up invention, like a hydronaut (a water sailor: someone who explores under the sea). Write a definition and draw it.
Read your chart to a grown-up. Explain how one Greek part helped you understand a word in science.

Your turn

What does aero mean? Give one word.

What is an astronaut, using the word parts?

Why is chlorophyll spelled with ch and ph?

What does symmetry mean? Use the parts.

Is it synpathy or sympathy? Why?

What does dynamic mean, using the root dynam?

Name the Greek parts in photosynthesis.

More practice: warm-up

What does naut mean?

What does cosm mean?

What does phyll mean?

What sound does ph make in Greek words?

What does path mean in sympathy?

More practice: on your own

What is a cosmonaut? Use the parts. (This is the word used for space travellers from Russia.)

Spell the word: syn + onym (name). Then explain it.

A plane's wing is aerodynamic. What does that mean?

Why do you think chloroplasts got their name?

Fix the spelling and explain: nawtical.

Challenge

Explain how empathy and sympathy are different, and how they are the same.

Aerospace engineers design aircraft and spacecraft. Explain why aero + space is a good name for their field.

Invent a word using two Greek parts from this lesson or earlier lessons. Spell it, give its word sum and a definition.

Check your understanding

Quiz

What does chlorophyll mean, using its parts?

Which spelling is correct?

What does naut mean?

Why does syn- become sym- in sympathy?

Which word means putting together with light?

Which word part means power or force?

For parents and teachers

Big idea (B2.1, B2.2, A3.1): Grade 6 students are expected to spell complex words using their knowledge of morphemes, and to learn vocabulary from other subjects. Many Grade 6 science words (flight, space, biodiversity) are built from Greek parts.

How to help at home:

When your child studies science, ask: "Which Greek parts can you see in that word?"
Look for Greek parts in the news, on food labels and in sports (an aerial trick in snowboarding!).
Encourage the invented-word game. It shows real understanding.

Common difficulties:

Spelling /f/ as f in Greek words (fotosynthesis). Remind them: Greek science words usually use ph.
syn/sym confusion. Say the word slowly: if the next sound is /b/, /m/ or /p/, it's sym.
Mixing up empathy and sympathy. Both are good; empathy means understanding from the inside.