observe vs invigilate

observe and invigilate both are verbs.

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

As verbs, invigilate is a hyponym of observe; that is, invigilate is a word with a more specific, narrower meaning than observe:

Other hyponyms of observe include keep tabs on, guard, proctor.

observe (verb)	invigilate (verb)
stick to correctly or closely	watch over (students taking an exam, to prevent cheating)
make mention of
watch attentively
observe with care or pay close attention to
discover or determine the existence, presence, or fact of by perception with the eyes
follow with the eyes or the mind
show respect towards
behave as expected during of holidays or rites
conform one's action or practice to