Yes, CONTRAS is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, N 1, T 1, R 1, A 1, S 1.

Is it a valid word?

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

a Nicaraguan counterrevolutionary guerrilla force from 1979 to 1990; it opposed a left-wing government, with support from the United States
a member of the guerrilla force that opposed a left-wing government in Nicaragua