enquiry vs probe

enquiry and probe both are nouns.

Word	Noun	Adjective	Verb	Adverb
enquiry	Yes	No	No	No
probe	Yes	No	Yes	No

As nouns, probe is a hyponym of enquiry; that is, probe is a word with a more specific, narrower meaning than enquiry:

enquiry (noun)	probe (noun)
a systematic investigation of a matter of public interest	an exploratory action or expedition
a search for knowledge	an investigation conducted using a flexible surgical instrument to explore an injury or a body cavity
an instance of questioning	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

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