There are 11 words that start with 'insan'.
| insane | insaner |
| insanely | insanest |
| insanity | insaneness |
| insanitary | insanities |
| insanenesses | insanitation |
| insanitations | |
Note: These 11 words that start with 'insan' are found from the USA & Canada version of the tournament Scrabble word list.