emptiness vs vacuum

emptiness and vacuum both are nouns.

Word	Noun	Adjective	Verb	Adverb
emptiness	Yes	No	No	No
vacuum	Yes	No	Yes	No

As nouns, emptiness and vacuum are synonyms defined as:

Other synonyms of emptiness include vacancy, void.

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

Other hyponyms of emptiness include blankness, hollowness, vacancy, vacuity.

emptiness (noun)	vacuum (noun)
the quality of being valueless or futile	an electrical home appliance that cleans by suction
an empty area or space	a region that is devoid of matter
the state of containing nothing	an empty area or space
having an empty stomach	the absence of matter

emptiness (verb)	vacuum (verb)
	clean with a vacuum cleaner