There are 18 7-letter words that start with 'lig'.
| ligands | ligases | ligated | ligates | 
| lighted | lighten | lighter | lightly | 
| lignans | lignify | lignins | lignite | 
| ligroin | ligulae | ligular | ligulas | 
| ligules | ligures | ||
Note: These 18 7-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)