forest vs tree

forest and tree both are nouns.

forest (noun)	tree (noun)
the trees and other plants in a large densely wooded area	a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms
land that is covered with trees and shrubs	a figure that branches from a single root

forest (verb)	tree (verb)
establish a forest on previously unforested land	force a person or an animal into a position from which he cannot escape
	plant with trees
	chase an animal up a tree
	stretch (a shoe) on a shoetree