- accord
- acid
- acidic
- acrid
- addict
- adroit
- arcadia
- ardor
- arid
- card
- cardiac
- cardio
- cardioid
- carotid
- cicada
- coda
- cord
- corrida
- corridor
- dart
- data
- diacritic
- dicta
- dictator
- didact
- didactic
- dirt
- ditto
- doctor
- dodo
- doodad
- door
- dorado
- dotard
- drat
- droid
- idiot
- idiotic
- octad
- odor
- radar
- radiator
- radii
- radio
- raid
- road
- rood
- toad
- toroid
- torrid
- triad
- trod