There are 11 words that end with 'gonia'.
| gonia | begonia | 
| pogonia | oogonia | 
| ascogonia | archegonia | 
| carpogonia | hormogonia | 
| sporogonia | spermagonia | 
| spermatogonia | |
Note: These 11 words that end with 'gonia' are found from the USA & Canada version of the tournament Scrabble word list.