There are 12 words that start with 'efflu'.
| efflux | effluent | effluvia | 
| effluxes | effluence | effluents | 
| effluvial | effluvium | effluxion | 
| effluences | effluviums | effluxions | 
Note: These 12 words that start with 'efflu' are found from the USA & Canada version of the tournament Scrabble word list.