There are 13 words that start with 'mains'.
| mains | mainsail |
| mainstay | mainsails |
| mainsheet | mainstays |
| mainsheets | mainspring |
| mainstream | mainsprings |
| mainstreams | mainstreamed |
| mainstreaming | |
Note: These 13 words that start with 'mains' are found from the USA & Canada version of the tournament Scrabble word list.