barometer vs aneroid

barometer and aneroid both are nouns.

Word	Noun	Adjective	Verb	Adverb
barometer	Yes	No	No	No
aneroid	Yes	Yes	No	No

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

Other hyponyms of barometer include aneroid barometer, barograph, mercury barometer, weatherglass, statoscope.

barometer (noun)	aneroid (noun)
an instrument that measures atmospheric pressure	a barometer that measures pressure without using fluids

barometer (adjective)	aneroid (adjective)
	containing no liquid or actuated without the use of liquid