Yes, ENTROPIES is a Scrabble word!

Letter values in Scrabble US: E 1, N 1, T 1, R 1, O 1, P 3, I 1, E 1, S 1.

Is it a valid word?

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

(communication theory) a numerical measure of the uncertainty of an outcome
(thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work

Also: selective information, s.