There are 25 6-letter words that start with 'qui'.
| quiche | quicks | quiets | quiffs | quills | 
| quilts | quince | quinic | quinin | quinoa | 
| quinol | quinsy | quinta | quinte | quints | 
| quippu | quippy | quipus | quired | quires | 
| quirks | quirky | quirts | quitch | quiver | 
Note: These 25 6-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)