pluton vs granite

pluton and granite both are nouns.

Word	Noun	Adjective	Verb	Adverb
pluton	Yes	No	No	No
granite	Yes	No	No	No

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

pluton: large mass of intrusive igneous rock believed to have solidified deep within the earth
granite: plutonic igneous rock having visibly crystalline texture; generally composed of feldspar and mica and quartz

pluton (noun)	granite (noun)
large mass of intrusive igneous rock believed to have solidified deep within the earth	something having the quality of granite (unyielding firmness)
	plutonic igneous rock having visibly crystalline texture; generally composed of feldspar and mica and quartz