There are 13 words that start with 'what'.
| what | whats |
| whatnot | whatsis |
| whatsit | whatever |
| whatness | whatnots |
| whatsits | whatsises |
| whatnesses | whatsoever |
| whatchamacallit | |
Note: These 13 words that start with 'what' are found from the USA & Canada version of the tournament Scrabble word list.