research vs enquiry

research and enquiry both are nouns.

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

As nouns, research and enquiry are synonyms defined as:

Other synonyms of research include inquiry.

research (noun)	enquiry (noun)
systematic investigation to establish facts	a systematic investigation of a matter of public interest
a search for knowledge	a search for knowledge
	an instance of questioning

research (verb)	enquiry (verb)
inquire into
attempt to find out in a systematically and scientific manner