tree farm vs timberland

tree farm and timberland both are nouns.

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

As nouns, timberland is a hypernym of tree farm; that is, timberland is a word with a broader meaning than tree farm:

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

Other hypernyms of tree farm include forest, timber, woodland.

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