enquiry vs experiment

enquiry and experiment both are nouns.

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

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

enquiry (noun)	experiment (noun)
a systematic investigation of a matter of public interest	the act of conducting a controlled test or investigation
a search for knowledge	a venture at something new or different
an instance of questioning	the testing of an idea

enquiry (verb)	experiment (verb)
	to conduct a test or investigation
	try something new, as in order to gain experience