Yes, TABERNACLES 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, S 1.

Is it a valid word?

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

a major Jewish festival beginning on the eve of the 15th of Tishri and commemorating the shelter of the Israelites during their 40 years in the wilderness
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: feast of booths, feast of tabernacles, mormon tabernacle.

Not playable in Scrabble US: SUCCOS.