insure vs watch

insure is not a noun while watch is a noun.

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

insure (noun)	watch (noun)
	a purposeful surveillance to guard or observe
	the rite of staying awake for devotional purposes (especially on the eve of a religious festival)
	a small portable timepiece
	a person employed to keep watch for some anticipated event
	a period of time (4 or 2 hours) during which some of a ship's crew are on duty
	the period during which someone (especially a guard) is on duty

insure (verb)	watch (verb)
be careful or certain to do something; make certain of something	find out, learn, or determine with certainty, usually by making an inquiry or other effort
protect by insurance	look attentively
make certain of	be vigilant, be on the lookout or be careful
take out insurance for	observe without intervening
	observe or determine by looking
	see or watch
	follow with the eyes or the mind