There are 4 12-letter words that start with 'swe'.
| sweaterdress | sweatinesses | sweepingness | 
| swelteringly | ||
Note: These 4 12-letter words that start with 'swe' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with swee, swea, swel, swer, swep, swed, swev.
5-letter words start with 'swe' (8)