woodland vs tree farm

woodland and tree farm both are nouns.

Word	Noun	Adjective	Verb	Adverb
woodland	Yes	No	No	No
tree farm	Yes	No	No	No

As nouns, tree farm is a hyponym of woodland; that is, tree farm is a word with a more specific, narrower meaning than woodland:

woodland: land that is covered with trees and shrubs
tree farm: a forest (or part of a forest) where trees are grown for commercial use

Other hyponyms of woodland include greenwood, riparian forest, silva, sylva.

woodland (noun)	tree farm (noun)
land that is covered with trees and shrubs	a forest (or part of a forest) where trees are grown for commercial use