timber vs tree farm

timber and tree farm both are nouns.

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

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

timber: 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 timber include greenwood, riparian forest, silva, sylva.

timber (noun)	tree farm (noun)
a beam made of wood	a forest (or part of a forest) where trees are grown for commercial use
a post made of wood
(music) the distinctive property of a complex sound (a voice or noise or musical sound)
land that is covered with trees and shrubs
the wood of trees cut and prepared for use as building material