There are 13 words that start with 'actini'.
| actinia | actinic | actiniae |
| actinian | actinias | actinide |
| actinism | actinium | actinians |
| actinides | actinisms | actiniums |
| actinically | ||
Note: These 13 words that start with 'actini' are found from the USA & Canada version of the tournament Scrabble word list.