There are 7 13-letter words that start with 'qui'.
| quincentenary | quindecillion | 
| quinquennials | quinquenniums | 
| quintessences | quintillionth | 
| quintuplicate | |
Note: These 7 13-letter words that start with 'qui' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with quin, quie, quic, quil, quir, quit, quip, quiz, quix, quiv, quib, quid, quis, quif.
4-letter words start with 'qui' (5)