There are 11 11-letter words that start with 'act'.
| actinically | actinolites | actinometer |
| actinometry | actinomyces | actinomycin |
| activations | actomyosins | actualities |
| actualizing | actuarially | |
Note: These 11 11-letter words that start with 'act' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with acti, actu, acto, acta, actr, acte, acts.
4-letter words start with 'act' (2)