biome vs forest

biome and forest both are nouns.

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

As nouns, forest is a hyponym of biome; that is, forest 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
forest: land that is covered with trees and shrubs

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

biome (noun)	forest (noun)
a major biotic community characterized by the dominant forms of plant life and the prevailing climate	the trees and other plants in a large densely wooded area
	land that is covered with trees and shrubs

biome (verb)	forest (verb)
	establish a forest on previously unforested land