biome vs timberland

biome and timberland both are nouns.

Word	Noun	Adjective	Verb	Adverb
biome	Yes	No	No	No
timberland	Yes	No	No	No

As nouns, timberland is a hyponym of biome; that is, timberland is a word with a more specific, narrower meaning than biome:

biome: a major biotic community characterized by the dominant forms of plant life and the prevailing climate
timberland: land that is covered with trees and shrubs

Other hyponyms of biome include desert, grassland, forest, timber, woodland.

biome (noun)	timberland (noun)
a major biotic community characterized by the dominant forms of plant life and the prevailing climate	land that is covered with trees and shrubs