There are 4 14-letter words that start with 'lig'.
| lightheartedly | lignifications | 
| lignocellulose | lignosulfonate | 
Note: These 4 14-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)