Yes, NEWER is a Scrabble word!

Letter values in Scrabble US: N 1, E 1, W 4, E 1, R 1.

Is it a valid word?

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

not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered
original and of a kind not seen before
lacking training or experience
having no previous example or precedent or parallel
other than the former one(s); different
unaffected by use or exposure
(of a new kind or fashion) gratuitously new
in use after medieval times
used of a living language; being the current stage in its development
(of crops) harvested at an early stage of development; before complete maturity
unfamiliar