Yes, PATTERNS is a Scrabble word!

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

Is it a valid word?

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

a perceptual structure
a customary way of operation or behavior
a decorative or artistic work
something regarded as a normative example
a model considered worthy of imitation
something intended as a guide for making something else
the path that is prescribed for an airplane that is preparing to land at an airport
graphical representation (in polar or Cartesian coordinates) of the spatial distribution of radiation from an antenna as a function of angle

Also: traffic pattern, approach pattern, radiation pattern, radiation diagram.