Yes, SEARCHER is a Scrabble word!

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

Is it a valid word?

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

someone making a search or inquiry
a customs official whose job is to search baggage or goods or vehicles for contraband or dutiable items
large metallic blue-green beetle that preys on caterpillars; found in North America

Also: searcher beetle, calosoma scrutator.