see to it vs watch

see to it is not a noun while watch is a noun.

Word	Noun	Adjective	Verb	Adverb
see to it	No	No	Yes	No
watch	Yes	No	Yes	No

see to it (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

see to it (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
	look attentively
	be vigilant, be on the lookout or be careful
	observe without intervening
	observe or determine by looking
	see or watch
	follow with the eyes or the mind