peridotite vs igneous rock

peridotite and igneous rock both are nouns.

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

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

peridotite: a dark coarse-grained igneous rock consisting principally of olivine
igneous rock: rock formed by the solidification of molten magma

peridotite (noun)	igneous rock (noun)
a dark coarse-grained igneous rock consisting principally of olivine	rock formed by the solidification of molten magma