tree vs limb

tree and limb both are nouns.

tree (noun)	limb (noun)
a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms	one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper
a figure that branches from a single root	any of the main branches arising from the trunk or a bough of a tree
	(astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet
	either of the two halves of a bow from handle to tip
	the graduated arc that is attached to an instrument for measuring angles
	any projection that is thought to resemble a human arm

tree (verb)	limb (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