look into vs probe

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

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

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

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

look into (noun)	probe (noun)
	an exploratory action or expedition
	an investigation conducted using a flexible surgical instrument to explore an injury or a body cavity
	a flexible slender surgical instrument with a blunt end that is used to explore wounds or body cavities
	an inquiry into unfamiliar or questionable activities

look into (verb)	probe (verb)
examine so as to determine accuracy, quality, or condition	question or examine thoroughly and closely
investigate scientifically	examine physically with or as if with a probe