hypsometer vs altimeter

hypsometer and altimeter both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypsometer	Yes	No	No	No
altimeter	Yes	No	No	No

As nouns, altimeter is a hypernym of hypsometer; that is, altimeter is a word with a broader meaning than hypsometer:

hypsometer: an altimeter that uses the boiling point of water to determine land elevation
altimeter: an instrument that measures the height above ground; used in navigation

hypsometer (noun)	altimeter (noun)
an altimeter that uses the boiling point of water to determine land elevation	an instrument that measures the height above ground; used in navigation