methane vs methane series

methane and methane series both are nouns.

Word	Noun	Adjective	Verb	Adverb
methane	Yes	No	No	No
methane series	Yes	No	No	No

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

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

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

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