There are 21 8-letter words that start with 'act'.
| actiniae | actinian | actinias | actinide |
| actinism | actinium | actinoid | actinons |
| actioner | activate | actively | activism |
| activist | activity | activize | actorish |
| actressy | actually | actuated | actuates |
| actuator | |||
Note: These 21 8-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)