There are 7 14-letter words that start with 'inv'.
| invaluableness | invasivenesses | 
| investigations | invigoratingly | 
| invincibleness | inviolableness | 
| invisibilities | |
Note: These 7 14-letter words that start with 'inv' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with inve, invi, inva, invo, invu.
5-letter words start with 'inv' (1)