plutonic rock vs igneous rock

plutonic rock and igneous rock both are nouns.

Word	Noun	Adjective	Verb	Adverb
plutonic rock	Yes	No	No	No
igneous rock	Yes	No	No	No

As nouns, igneous rock is a hypernym of plutonic rock; that is, igneous rock is a word with a broader meaning than plutonic rock:

plutonic rock: large mass of intrusive igneous rock believed to have solidified deep within the earth
igneous rock: rock formed by the solidification of molten magma

plutonic rock (noun)	igneous rock (noun)
large mass of intrusive igneous rock believed to have solidified deep within the earth	rock formed by the solidification of molten magma