Yes, IRONWOODS is a Scrabble word!

Letter values in Scrabble US: I 1, R 1, O 1, N 1, W 4, O 1, O 1, D 2, S 1.

Is it a valid word?

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

handsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfume; source of very heavy hardwood used for railroad ties
exceptionally tough or hard wood of any of a number of ironwood trees
a small slow-growing deciduous tree of northern Iran having a low domed shape
medium-sized hop hornbeam of eastern North America

Also: rose chestnut, ironwood tree, mesua ferrea, iron tree, iron-tree, eastern hop hornbeam, ostrya virginiana.