tree vs burl

tree and burl both are nouns.

tree (noun)	burl (noun)
a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms	the wood cut from a tree burl or outgrowth; often used decoratively in veneer
a figure that branches from a single root	a large rounded outgrowth on the trunk or branch of a tree
	soft lump or unevenness in a yarn; either an imperfection or created by design

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