vacuum pump vs inflator

vacuum pump and inflator both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacuum pump	Yes	No	No	No
inflator	Yes	No	No	No

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

Other hyponyms of vacuum pump include condensation pump, diffusion pump, inflater, ion pump, molecular pump.

vacuum pump (noun)	inflator (noun)
a pump that moves air in or out of something	an air pump operated by hand to inflate something (as a tire)