look into vs check into

look into and check into both are verbs.

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

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

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

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

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