proctor vs invigilate

proctor is a noun but invigilate is not a noun.

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

As verbs, proctor and invigilate are synonyms defined as:

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

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

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