There are 29 9-letter words that start with 'apo'.
Note: These 29 9-letter words that start with 'apo' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with apos, apol, apoc, apop, apot, apod, apog, apom, apoa, apon, apor, apoe.
4-letter words start with 'apo' (2)