enquiry vs means test

enquiry and means test both are nouns.

Word	Noun	Adjective	Verb	Adverb
enquiry	Yes	No	No	No
means test	Yes	No	No	No

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

enquiry: a systematic investigation of a matter of public interest
means test: an inquiry into the financial position of someone applying for financial aid

Other hyponyms of enquiry include inquest.

enquiry (noun)	means test (noun)
a systematic investigation of a matter of public interest	an inquiry into the financial position of someone applying for financial aid
a search for knowledge
an instance of questioning