geology vs hypsography

geology and hypsography both are nouns.

Word	Noun	Adjective	Verb	Adverb
geology	Yes	No	No	No
hypsography	Yes	No	No	No

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

geology: a science that deals with the history of the earth as recorded in rocks
hypsography: the scientific study of the earth's configuration above sea level (emphasizing the measurement of land altitudes relative to sea level)

geology (noun)	hypsography (noun)
a science that deals with the history of the earth as recorded in rocks	measurement of the elevation of land above sea level
	the scientific study of the earth's configuration above sea level (emphasizing the measurement of land altitudes relative to sea level)