- cirri
- citric
- citron
- coir
- confront
- contort
- contortion
- contrition
- corn
- critic
- croc
- croci
- croon
- fort
- friction
- front
- intro
- iron
- ironic
- nitric
- nitro
- noir
- nori
- ricin
- riff
- rift
- riot
- rococo
- roof
- root
- roti
- rotini
- rotor
- tori
- toric
- torii
- torn
- toro
- tort
- tortoni
- tricorn
- tricot
- trio
- triton
- trot