Yes, WALKERS is a Scrabble word!

Letter values in Scrabble US: W 4, A 1, L 1, K 5, E 1, R 1, S 1.

Is it a valid word?

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

New Zealand runner who in 1975 became the first person to run a mile in less that 3 minutes and 50 seconds (born in 1952)
United States writer (born in 1944)
a person who travels by foot
a shoe designed for comfortable walking
a light enclosing framework (trade name Zimmer) with rubber castors or wheels and handles; helps invalids or the handicapped or the aged to walk
an enclosing framework on casters or wheels; helps babies learn to walk

Also: john walker, alice walker, alice malsenior walker, zimmer frame, baby-walker, go-cart.

Not playable in Scrabble US: ZIMMER.