| dark | darker | darkest | darkness | darkened | darkening |
| chalk | chalks | chalky | chalked | chalking | chalkboard |
| kite | kites | kited | kiter | kiting | kiting |
| cart | carts | cartoon | carting | cartwheel | cartilage |
| duck | ducks | ducked | ducking | ducklings | duckpond |
| trick | tricks | tricky | tricking | trickiest | trickster |
| occur | occurs | occurred | occurring | occurrence | occurrences |
| hiccup | hiccups | hiccupped | hiccupping | hiccupped | hiccupping |
