There are 16 words that start with 'invit'.
| invite | invital | 
| invited | invitee | 
| inviter | invites | 
| invitees | inviters | 
| inviting | invitation | 
| invitatory | invitingly | 
| invitations | invitational | 
| invitatories | invitationals | 
Note: These 16 words that start with 'invit' are found from the USA & Canada version of the tournament Scrabble word list.