There are 3 13-letter words that start with 'fat'.
| fatefulnesses | fatheadedness |
| fatuousnesses | |
Note: These 3 13-letter words that start with 'fat' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with fath, fatt, fata, fati, fats, fate, fatu, fatl, fatb, fatw, fatn.
4-letter words start with 'fat' (2)