There are 16 words that start with 'cusp'.
| cusp | cusps | cuspal |
| cusped | cuspid | cuspis |
| cuspate | cuspids | cuspated |
| cuspidal | cuspides | cuspidor |
| cuspidate | cuspidors | cuspidation |
| cuspidations | ||
Note: These 16 words that start with 'cusp' are found from the USA & Canada version of the tournament Scrabble word list.