Yes, TURNOUTS is a Scrabble word!

Letter values in Scrabble US: T 1, U 1, R 1, N 1, O 1, U 1, T 1, S 1.

Is it a valid word?

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

the group that gathers together for a particular occasion
a part of a road that has been widened to allow cars to pass or park
a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass
what is produced in a given time period
a set of clothing (with accessories)
attendance for a particular event or purpose (as to vote in an election)
(ballet) the outward rotation of a dancer's leg from the hip

Also: railroad siding.