deciduous forest vs forest

deciduous forest and forest both are nouns.

As nouns, forest is a hypernym of deciduous forest; that is, forest is a word with a broader meaning than deciduous forest:

deciduous forest: a forest comprising mainly of broad-leaved trees that shed all their leaves during one season.
forest: the trees and other plants in a large densely wooded area

Other hypernyms of deciduous forest include wood, woods.

deciduous forest (noun)	forest (noun)
a forest comprising mainly of broad-leaved trees that shed all their leaves during one season.	the trees and other plants in a large densely wooded area
	land that is covered with trees and shrubs

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