There are 12 words that start with 'alga'.
| alga | algae | algal |
| algas | algaroba | algaecide |
| algarobas | algarroba | algarrobo |
| algaecides | algarrobas | algarrobos |
Note: These 12 words that start with 'alga' are found from the USA & Canada version of the tournament Scrabble word list.