There are 12 words that start with 'inun'.
| inundant | inundate | inunction | 
| inundated | inundates | inundator | 
| inunctions | inundating | inundation | 
| inundators | inundatory | inundations | 
Note: These 12 words that start with 'inun' are found from the USA & Canada version of the tournament Scrabble word list.