alkane series vs butane

alkane series and butane both are nouns.

Word	Noun	Adjective	Verb	Adverb
alkane series	Yes	No	No	No
butane	Yes	No	No	No

As nouns, butane is a hyponym of alkane series; that is, butane is a word with a more specific, narrower meaning than alkane series:

alkane series: a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)
butane: occurs in natural gas; used in the manufacture of rubber and fuels

Other hyponyms of alkane series include amine, aminoalkane, C2H6, ethane, heptane, hexane, methane.

alkane series (noun)	butane (noun)
a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)	occurs in natural gas; used in the manufacture of rubber and fuels