octane vs hydrocarbon

octane and hydrocarbon both are nouns.

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

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

octane: any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent
hydrocarbon: an organic compound containing only carbon and hydrogen

octane (noun)	hydrocarbon (noun)
any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent	an organic compound containing only carbon and hydrogen