There are 18 words that start with 'fatt'.
| fatty | fatted | fatten |
| fatter | fattens | fattest |
| fattier | fatties | fattily |
| fatting | fattish | fattened |
| fattener | fattiest | fatteners |
| fattening | fattiness | fattinesses |
Note: These 18 words that start with 'fatt' are found from the USA & Canada version of the tournament Scrabble word list.