tree vs treetop

tree and treetop both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree	Yes	No	Yes	No
treetop	Yes	No	No	No

tree (noun)	treetop (noun)
a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms	the upper branches and leaves of a tree or other plant
a figure that branches from a single root

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