Yes, ANALYST is a Scrabble word!

Letter values in Scrabble US: A 1, N 1, A 1, L 1, Y 4, S 1, T 1.

Is it a valid word?

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

someone who is skilled at analyzing data
an expert who studies financial data (on credit or securities or sales or financial patterns etc.) and recommends appropriate business actions
a licensed practitioner of psychoanalysis