- cocci
- cocoon
- cocooned
- code
- coded
- codeine
- codon
- coed
- coin
- coincide
- coincided
- coincidence
- coined
- concede
- conceded
- condo
- condone
- condoned
- cone
- coned
- conic
- conjoin
- conjoined
- conned
- cooed
- deco
- decode
- decoded
- dino
- diode
- dodo
- dojo
- done
- donee
- donned
- ecocide
- encode
- encoded
- enjoin
- enjoined
- icon
- iconic
- innocence
- iodine
- ionic
- join
- joined
- neocon
- neon
- nodded
- node
- nonce
- none
- noon
- odeon
- once
- onion