Yes, TAPPERS is a Scrabble word!

Letter values in Scrabble US: T 1, A 1, P 3, P 3, E 1, R 1, S 1.

Is it a valid word?

TAPPERS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a tavern keeper who taps kegs or casks
a person who strikes a surface lightly and usually repeatedly
a worker who uses a tap to cut screw threads
someone who wiretaps a telephone or telegraph wire
a dancer who sounds out rhythms by using metal taps on the toes and heels of the shoes

Also: phone tapper, tap dancer.