barometer vs barograph

barometer and barograph both are nouns.

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

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

barometer: an instrument that measures atmospheric pressure
barograph: a recording barometer; automatically records on paper the variations in atmospheric pressure

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

barometer (noun)	barograph (noun)
an instrument that measures atmospheric pressure	a recording barometer; automatically records on paper the variations in atmospheric pressure