There are 11 words that start with 'oxal'.
| oxalic | oxalis | 
| oxalate | oxalated | 
| oxalates | oxalises | 
| oxalating | oxalacetate | 
| oxalacetates | oxaloacetate | 
| oxaloacetates | |
Note: These 11 words that start with 'oxal' are found from the USA & Canada version of the tournament Scrabble word list.