There are 7 6-letter words that start with 'eff'.
| efface | effect | effete | effigy | efflux | 
| effort | effuse | |||
Note: These 7 6-letter words that start with 'eff' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with effe, effl, effu, effi, effa, effo, effr, effs.
4-letter words start with 'eff' (1)