Yes, SCISSORTAILS is a Scrabble word!

Letter values in Scrabble US: S 1, C 3, I 1, S 1, S 1, O 1, R 1, T 1, A 1, I 1, L 1, S 1.

Is it a valid word?

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

grey flycatcher of the southwestern United States and Mexico and Central America having a long forked tail and white breast and salmon and scarlet markings

Also: scissortailed flycatcher, muscivora-forficata.