Yes, SACRAMENT is a Scrabble word!

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

Is it a valid word?

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

a formal religious ceremony conferring a specific grace on those who receive it; the two Protestant ceremonies are baptism and the Lord's Supper; in the Roman Catholic Church and the Eastern Orthodox Church there are seven traditional rites accepted as instituted by Jesus: baptism and confirmation and Holy Eucharist and penance and holy orders and matrimony and extreme unction