Yes, ANCHOR is a Scrabble word!

Letter values in Scrabble US: A 1, N 1, C 3, H 4, O 1, R 1.

Is it a valid word?

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

a mechanical device that prevents a vessel from moving
a central cohesive source of support and stability
a television reporter who coordinates a broadcast to which several correspondents contribute

Also: ground tackle, cast anchor, drop anchor.