virgin forest vs woods

virgin forest and woods both are nouns.

Word	Noun	Adjective	Verb	Adverb
virgin forest	Yes	No	No	No
woods	Yes	No	No	No

As nouns, woods is a hypernym of virgin forest; that is, woods is a word with a broader meaning than virgin forest:

virgin forest: forest or woodland having a mature or overly mature ecosystem more or less uninfluenced by human activity
woods: the trees and other plants in a large densely wooded area

Other hypernyms of virgin forest include forest, wood.

virgin forest (noun)	woods (noun)
forest or woodland having a mature or overly mature ecosystem more or less uninfluenced by human activity	the trees and other plants in a large densely wooded area