cinch vs insure

cinch is a noun but insure is not a noun.

Word	Noun	Adjective	Verb	Adverb
cinch	Yes	No	Yes	No
insure	No	No	Yes	No

As verbs, insure is a hypernym of cinch; that is, insure is a word with a broader meaning than cinch:

Other hypernyms of cinch include ascertain, assure, check, control, ensure, see, see to it.

cinch (noun)	insure (noun)
a form of all fours in which the players bid for the privilege of naming trumps
any undertaking that is easy to do
stable gear consisting of a band around a horse's belly that holds the saddle in place

cinch (verb)	insure (verb)
get a grip on; get mastery of	be careful or certain to do something; make certain of something
make sure of	protect by insurance
tie a cinch around	make certain of
	take out insurance for