Yes, LABOURS is a Scrabble word!

Letter values in Scrabble US: L 1, A 1, B 3, O 1, U 1, R 1, S 1.

Is it a valid word?

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

a social class comprising those who do manual labor or work for wages
concluding state of pregnancy; from the onset of contractions to the birth of a child
a political party formed in Great Britain in 1900; characterized by the promotion of labor's interests and formerly the socialization of key industries
productive work (especially physical work done for wages)

Also: working class, lying-in, british labour party, labour party.

Not playable in Scrabble US: PARTURIENCY.