paraffin vs C2H6

paraffin and C2H6 both are nouns.

Word	Noun	Adjective	Verb	Adverb
paraffin	Yes	No	No	No
C2H6	Yes	No	No	No

As nouns, C2H6 is a hyponym of paraffin; that is, C2H6 is a word with a more specific, narrower meaning than paraffin:

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

Other hyponyms of paraffin include butane, amine, aminoalkane, ethane, heptane, hexane, methane.

paraffin (noun)	C2H6 (noun)
from crude petroleum; used for candles and for preservative or waterproof coatings	a colorless odorless alkane gas used as fuel
(British usage) kerosine
a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)