geology vs mineralogy

geology and mineralogy both are nouns.

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

As nouns, mineralogy is a hyponym of geology; that is, mineralogy 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
mineralogy: the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them

geology (noun)	mineralogy (noun)
a science that deals with the history of the earth as recorded in rocks	the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them