woodgrain vs wood grain

woodgrain and wood grain both are nouns.

Word	Noun	Adjective	Verb	Adverb
woodgrain	Yes	No	No	No
wood grain	Yes	No	No	No

As nouns, woodgrain and wood grain are synonyms defined as:

Other synonyms of woodgrain include woodiness.

woodgrain (noun)	wood grain (noun)
texture produced by the fibers in wood	texture produced by the fibers in wood