There are 10 13-letter words that start with 'ina'.
| inactivations | inadvertences | 
| inadvertently | inanimateness | 
| inappreciable | inappreciably | 
| inappropriate | inarticulates | 
| inattentively | inaugurations | 
Note: These 10 13-letter words that start with 'ina' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with inap, inac, inar, inau, inad, inan, inal, inat, inam, inab.
5-letter words start with 'ina' (3)