check up on vs look into

check up on and look into both are verbs.

Word	Noun	Adjective	Verb	Adverb
check up on	No	No	Yes	No
look into	No	No	Yes	No

As verbs, check up on and look into are synonyms defined as:

check up on and look into: examine so as to determine accuracy, quality, or condition

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

check up on (verb)	look into (verb)
examine so as to determine accuracy, quality, or condition	examine so as to determine accuracy, quality, or condition
	investigate scientifically