heptane vs alkane

heptane and alkane both are nouns.

Word	Noun	Adjective	Verb	Adverb
heptane	Yes	No	No	No
alkane	Yes	No	No	No

As nouns, alkane is a hypernym of heptane; that is, alkane is a word with a broader meaning than heptane:

heptane: a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings
alkane: a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)

Other hypernyms of heptane include alkane series, methane series, paraffin, paraffin series.

heptane (noun)	alkane (noun)
a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings	a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)