There are 502 13-letter words that start with 'a'.
Note: These 502 13-letter words that start with 'a' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with an, al, ar, ac, ap, as, am, ad, ab, au, at, ag, af, ai, av, ae, aw, ax, aq, az, aa, ah, ay, ao, ak, aj.
2-letter words start with 'a' (16)