Yes, ORCHISES is a Scrabble word!

Letter values in Scrabble US: O 1, R 1, C 3, H 4, I 1, S 1, E 1, S 1.

Is it a valid word?

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

any of various deciduous terrestrial orchids having fleshy tubers and flowers in erect terminal racemes
one of the two male reproductive glands that produce spermatozoa and secrete androgens

Not playable in Scrabble US: BALLOCK, BOLLOCK.