There are 4 15-letter words that start with 'chan'.
| chancellorships | changeabilities | 
| changefulnesses | channelizations | 
Note: These 4 15-letter words that start with 'chan' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with chanc, chang, chant, chann, chand, chans, chanf, chano.
5-letter words start with 'chan' (2)