tree vs wood

tree and wood both are nouns.

tree (noun)	wood (noun)
a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms	the hard fibrous lignified substance under the bark of trees
a figure that branches from a single root	the trees and other plants in a large densely wooded area
	any wind instrument other than the brass instruments
	a golf club with a long shaft used to hit long shots; originally made with a wooden head

tree (verb)	wood (verb)
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