There are 16 words that start with 'affir'.
| affirm | affirms |
| affirmed | affirmer |
| affirmant | affirmers |
| affirming | affirmable |
| affirmance | affirmants |
| affirmances | affirmation |
| affirmative | affirmations |
| affirmatives | affirmatively |
Note: These 16 words that start with 'affir' are found from the USA & Canada version of the tournament Scrabble word list.