There are 141 words that start with 'ko'.
Note: These 141 words that start with 'ko' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with kol, kop, kor, kou, koo, kom, kot, koa, kob, kos, kow, koh, koi, kon, koe, koj, kok.
3-letter words start with 'ko' (6)