watch over vs proctor

watch over is not a noun while proctor is a noun.

Word	Noun	Adjective	Verb	Adverb
watch over	No	No	Yes	No
proctor	Yes	No	Yes	No

As verbs, proctor is a hyponym of watch over; that is, proctor is a word with a more specific, narrower meaning than watch over:

Other hyponyms of watch over include keep tabs on, guard, invigilate.

watch over (noun)	proctor (noun)
	someone who supervises (an examination)

watch over (verb)	proctor (verb)
follow with the eyes or the mind	watch over (students taking an exam, to prevent cheating)