There are 16 words that start with 'flir'.
| flir | flirs | 
| flirt | flirts | 
| flirty | flirted | 
| flirter | flirters | 
| flirtier | flirting | 
| flirtiest | flirtation | 
| flirtations | flirtatious | 
| flirtatiously | flirtatiousness | 
Note: These 16 words that start with 'flir' are found from the USA & Canada version of the tournament Scrabble word list.