There are 13 words that end with 'gonal'.
| agonal | diagonal | isogonal |
| trigonal | decagonal | hexagonal |
| nonagonal | octagonal | polygonal |
| heptagonal | pentagonal | orthogonal |
| tetragonal | ||
Note: These 13 words that end with 'gonal' are found from the USA & Canada version of the tournament Scrabble word list.