There are 17 words that start with 'swim'.
| swim | swims | swimmy |
| swimmer | swimmers | swimmier |
| swimmily | swimming | swimsuit |
| swimwear | swimmable | swimmeret |
| swimmiest | swimmings | swimsuits |
| swimmerets | swimmingly | |
Note: These 17 words that start with 'swim' are found from the USA & Canada version of the tournament Scrabble word list.