watch vs assure

watch is a noun but assure is not a noun.

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

watch (noun)	assure (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

watch (verb)	assure (verb)
find out, learn, or determine with certainty, usually by making an inquiry or other effort	be careful or certain to do something; make certain of something
look attentively	inform positively and with certainty and confidence
be vigilant, be on the lookout or be careful	assure somebody of the truth of something with the intention of giving the listener confidence
observe without intervening	make a promise or commitment
observe or determine by looking	make certain of
see or watch
follow with the eyes or the mind