Yes, TABERNACLE is a Scrabble word!

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

Is it a valid word?

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

the Mormon temple
(Judaism) a portable sanctuary in which the Jews carried the Ark of the Covenant on their exodus
(Judaism) the place of worship for a Jewish congregation

Also: mormon tabernacle.