pyrene vs hydrocarbon

pyrene and hydrocarbon both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyrene	Yes	No	No	No
hydrocarbon	Yes	No	No	No

As nouns, hydrocarbon is a hypernym of pyrene; that is, hydrocarbon is a word with a broader meaning than pyrene:

pyrene: a pale yellow crystalline hydrocarbon C16H10 extracted from coal tar
hydrocarbon: an organic compound containing only carbon and hydrogen

pyrene (noun)	hydrocarbon (noun)
the small hard nutlet of a drupe or drupelet; the seed and the hard endocarp that surrounds it	an organic compound containing only carbon and hydrogen
a pale yellow crystalline hydrocarbon C16H10 extracted from coal tar