look into vs research

look into is not a noun while research is a noun.

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

As verbs, research is a hyponym of look into; that is, research is a word with a more specific, narrower meaning than look into:

Other hyponyms of look into include explore, search, explore, examine, probe, experiment.

look into (noun)	research (noun)
	systematic investigation to establish facts
	a search for knowledge

look into (verb)	research (verb)
examine so as to determine accuracy, quality, or condition	inquire into
investigate scientifically	attempt to find out in a systematically and scientific manner