There are 90 13-letter words that start with 'ca'.
Note: These 90 13-letter words that start with 'ca' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with car, can, cal, cat, cap, cas, cam, cab, cau, cav, cac, cad, cae, cag, cai, caf, caj, cak, cay, cah, caw, cao, caz.
3-letter words start with 'ca' (9)