There are 19 8-letter words that start with 'eff'.
| effacers | effacing | effected | effecter | 
| effector | effendis | efferent | effetely | 
| efficacy | effigial | effigies | effluent | 
| effluvia | effluxes | effulged | effulges | 
| effusing | effusion | effusive | |
Note: These 19 8-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)