probe vs dig into

probe is a noun but dig into is not a noun.

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

As verbs, probe and dig into are synonyms defined as:

Other synonyms of probe include poke into.

probe (noun)	dig into (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

probe (verb)	dig into (verb)
question or examine thoroughly and closely	examine physically with or as if with a probe
examine physically with or as if with a probe