observe vs look into

observe and look into both are verbs.

Word	Noun	Adjective	Verb	Adverb
observe	No	No	Yes	No
look into	No	No	Yes	No

As verbs, look into is a hypernym of observe; that is, look into is a word with a broader meaning than observe:

Other hypernyms of observe include check, check into, check out, check over, check up on, go over, suss out.

observe (verb)	look into (verb)
stick to correctly or closely	examine so as to determine accuracy, quality, or condition
make mention of	investigate scientifically
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