alkane series vs ethane

alkane series and ethane both are nouns.

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

As nouns, ethane is a hyponym of alkane series; that is, ethane 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)
ethane: a colorless odorless alkane gas used as fuel

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

alkane series (noun)	ethane (noun)
a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)	a colorless odorless alkane gas used as fuel