coal oil vs paraffin

coal oil and paraffin both are nouns.

Word	Noun	Adjective	Verb	Adverb
coal oil	Yes	No	No	No
paraffin	Yes	No	No	No

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

Other hyponyms of coal oil include paraffin oil.

coal oil (noun)	paraffin (noun)
a flammable hydrocarbon oil used as fuel in lamps and heaters	from crude petroleum; used for candles and for preservative or waterproof coatings
	(British usage) kerosine
	a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2)