watch vs watch case

watch and watch case both are nouns.

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

watch (noun)	watch case (noun)
a purposeful surveillance to guard or observe	the metal case in which the works of a watch are housed
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)	watch case (verb)
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