Yes, BOOKEND is a Scrabble word!

Letter values in Scrabble US: B 3, O 1, O 1, K 5, E 1, N 1, D 2.

Is it a valid word?

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

a support placed at the end of a row of books to keep them upright (on a shelf or table)