There are 5 15-letter words that start with 'lig'.
| lightfastnesses | lightsomenesses | 
| lignocelluloses | lignocellulosic | 
| lignosulfonates | |
Note: These 5 15-letter words that start with 'lig' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with ligh, liga, lign, ligu, ligr, lige.
5-letter words start with 'lig' (3)