There are 20 words that start with 'liga'.
| ligan | ligand | ligans | 
| ligase | ligate | ligands | 
| ligases | ligated | ligates | 
| ligament | ligating | ligation | 
| ligative | ligature | ligaments | 
| ligations | ligatured | ligatures | 
| ligaturing | ligamentous | |
Note: These 20 words that start with 'liga' are found from the USA & Canada version of the tournament Scrabble word list.