C2H6 vs alkane series

C2H6 and alkane series both are nouns.

Word	Noun	Adjective	Verb	Adverb
C2H6	Yes	No	No	No
alkane series	Yes	No	No	No

As nouns, alkane series is a hypernym of C2H6; that is, alkane series is a word with a broader meaning than C2H6:

C2H6: a colorless odorless alkane gas used as fuel
alkane series: a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)

Other hypernyms of C2H6 include hydrocarbon, alkane, methane series, paraffin, paraffin series.

C2H6 (noun)	alkane series (noun)
a colorless odorless alkane gas used as fuel	a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)