There are 44 10-letter words that start with 'at'.
Note: These 44 10-letter words that start with 'at' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with att, ato, ath, ata, atr, ate, atm, atl, aty, atw, ati.
3-letter words start with 'at' (2)