There are 10 15-letter words that start with 'col'.
| coldheartedness | collaboratively |
| collateralities | collateralizing |
| collectednesses | collenchymatous |
| colloquialities | colonizationist |
| colorfastnesses | colorlessnesses |
Note: These 10 15-letter words that start with 'col' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with coll, colo, colu, cole, coli, cold, colt, colc, cola, colp, colb, colz, cols, coly.
4-letter words start with 'col' (6)