There are 17 words that start with 'addu'.
| adduce | adduct | adduced |
| adducer | adduces | adducts |
| adducent | adducers | adducing |
| adducted | adductor | adducible |
| adducting | adduction | adductive |
| adductors | adductions | |
Note: These 17 words that start with 'addu' are found from the USA & Canada version of the tournament Scrabble word list.