Yes, TENDERNESSES is a Scrabble word!

Letter values in Scrabble US: T 1, E 1, N 1, D 2, E 1, R 1, N 1, E 1, S 1, S 1, E 1, S 1.

Is it a valid word?

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

a tendency to express warm and affectionate feeling
a pain that is felt (as when the area is touched)
warm compassionate feelings
a positive feeling of liking
a feeling of concern for the welfare of someone (especially someone defenseless)

Also: tenderheartedness, affectionateness.

Not playable in Scrabble US: PHILIA.