loosen vs lever

loosen is not a noun while lever is a noun.

Word	Noun	Adjective	Verb	Adverb
loosen	No	No	Yes	No
lever	Yes	No	Yes	No

loosen (noun)	lever (noun)
	a rigid bar pivoted about a fulcrum
	a flat metal tumbler in a lever lock
	a simple machine that gives a mechanical advantage when given a fulcrum

loosen (verb)	lever (verb)
become loose or looser or less tight	to move or force, especially in an effort to get something open
make loose or looser
make less dense
disentangle and raise the fibers of
cause to become loose
become less severe or strict
make less severe or strict