invigilate vs proctor

invigilate is not a noun while proctor is a noun.

Word	Noun	Adjective	Verb	Adverb
invigilate	No	No	Yes	No
proctor	Yes	No	Yes	No

As verbs, invigilate and proctor are synonyms defined as:

invigilate and proctor: watch over (students taking an exam, to prevent cheating)

invigilate (noun)	proctor (noun)
	someone who supervises (an examination)

invigilate (verb)	proctor (verb)
watch over (students taking an exam, to prevent cheating)	watch over (students taking an exam, to prevent cheating)