- [ ] cabin
- [ ] cabinet
- [ ] cable
- [ ] cactus
- [ ] cafeteria
- [ ] calibration
- [x] candidate
- [ ] cannibalism
- [x] canopy
- [x] canvas
- [x] cape
- [ ] capillary
- [ ] captive
- [x] carbon
- [ ] cardiac
- [ ] cardinal
- [x] care for
- [ ] caribou
- [ ] carnivore
- [ ] carp
- [x] carry on
- [ ] carry out
- [ ] cart
- [ ] cartilage
- [ ] cascade
- [ ] cassette
- [x] catalog
- [ ] catalyst
- [ ] catastrophe
- [ ] catch on
- [x] category
- [ ] caterpillar
- [ ] cavity
- [ ] cease
- [x] celestial
- [x] cell
- [ ] census
- [ ] centennial
- [ ] ceramic
- [ ] certificate
- [ ] chafe
- [ ] chamber
- [ ] champion
- [x] channel
- [x] chapel
- [x] characteristic
- [ ] charcoal
- [x] chart
- [ ] charter
- [ ] check in
- [x] check out
- [x] cheer up
- [x] chief
- [x] chill
- [x] chilled
- [ ] chip
- [x] choir
- [ ] cholesterol
- [ ] choreographer
- [ ] chromosome
- [x] chronical
- [ ] circular
- [ ] circulation
- [ ] circumference
- [x] circumstance
- [x] claim
- [ ] clam
- [ ] clamor
- [x] clarify
- [ ] clay
- [ ] clear up
- [x] client
- [ ] cliff
- [ ] cling
- [ ] cling to
- [x] clinical
- [ ] clipper
- [ ] closet
- [x] clue
- [ ] clump
- [ ] clumsy
- [ ] cluster
- [ ] clutch
- [ ] coarse
- [ ] coax
- [x] code
- [ ] coexist
- [ ] cognition
- [x] coherent
- [ ] cohesion
- [ ] coil
- [x] coincide
- [x] collaborator
- [x] collapse
- [x] collect
- [ ] collectively
- [ ] collide
- [ ] collide with
- [ ] colonize
- [x] colony
- [x] column
- [ ] combat
- [x] combination
- [x] combine
- [x] combine with
- [ ] combustible
- [ ] come along
- [ ] come down with
- [x] come from
- [x] come in
- [x] come out
- [x] come to the point
- [x] come up
- [ ] comet
- [ ] comic
- [ ] commemorate
- [x] comment
- [ ] commentary
- [ ] commerce
- [ ] commission
- [ ] committee
- [ ] commodity
- [ ] communal
- [ ] commute
- [ ] compact
- [x] companion
- [ ] comparable
- [x] compare to
- [x] compare with
- [x] comparison
- [ ] compass
- [ ] compatible
- [x] compel
- [x] compensate
- [ ] compete
- [ ] compete with
- [ ] competence
- [x] compile
- [ ] complement
- [ ] complementary
- [ ] complicated
- [ ] compliment
- [ ] composition
- [ ] compound
- [ ] compress
- [ ] comprise
- [ ] compromise
- [ ] compulsory
- [ ] conceal
- [ ] concede
- [ ] conceive
- [x] concentrate on
- [ ] concise
- [x] conclusive
- [ ] condensation
- [ ] conductivity
- [ ] confederacy
- [ ] confer
- [ ] conference
- [x] configuration
- [ ] conform
- [ ] conform to
- [ ] congenial
- [ ] congestion
- [x] congress
- [ ] consequently
- [x] conservation
- [x] conserve
- [x] considerable
- [ ] considerate
- [x] consist of
- [ ] consonant
- [ ] consort
- [ ] constellation
- [ ] constituent
- [ ] constitude
- [ ] constitution
- [ ] constrain
- [ ] constricted
- [x] consult
- [ ] consumption
- [ ] contagious
- [x] contain
- [ ] contaminate
- [ ] contemporary
- [ ] content
- [ ] contest
- [ ] context
- [ ] continent
- [x] continuation
- [x] continuum
- [x] contour
- [ ] contract
- [ ] contrast
- [x] contrast with
- [x] contribute to
- [ ] controversy
- [ ] convection
- [ ] convention
- [ ] conventional
- [ ] converge
- [x] conversation
- [ ] converse
- [x] convert
- [ ] convey
- [x] cool down
- [ ] cooperative
- [ ] coordinate
- [ ] cope with
- [ ] copper
- [ ] coral
- [ ] corporate
- [ ] correspond
- [ ] correspondence
- [ ] corrosion
- [ ] corrosive
- [ ] costume
- [ ] counseling
- [ ] counselor
- [x] count in
- [ ] count on
- [ ] count out
- [ ] counteract
- [ ] counterpart
- [ ] coupon
- [ ] court
- [ ] crab
- [ ] cramped
- [ ] crater
- [ ] crawl
- [x] creativity
- [ ] credential
- [x] credit
- [ ] crest
- [ ] crew
- [ ] crippling
- [ ] crisscross
- [ ] criterion
- [x] critic
- [ ] crow
- [x] crown
- [x] crucial
- [ ] crude
- [ ] crusade
- [ ] crush
- [ ] crust
- [ ] crustacean
- [ ] cue
- [ ] cultivated
- [ ] cumbersome
- [ ] cuneiform
- [x] curiosity
- [x] current
- [ ] curriculum
- [ ] cushion
- [x] cut away
- [ ] cut down
- [x] cut off
- [x] cylinder