There are 18 words that start with 'commut'.
| commute | commuted | 
| commuter | commutes | 
| commutate | commuters | 
| commuting | commutable | 
| commutated | commutates | 
| commutator | commutating | 
| commutation | commutative | 
| commutators | commutations | 
| commutativity | commutativities | 
Note: These 18 words that start with 'commut' are found from the USA & Canada version of the tournament Scrabble word list.