coal oil vs lamp oil

coal oil and lamp oil both are nouns.

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

As nouns, coal oil and lamp oil are synonyms defined as:

coal oil and lamp oil: a flammable hydrocarbon oil used as fuel in lamps and heaters

Other synonyms of coal oil include kerosene, kerosine.

coal oil (noun)	lamp oil (noun)
a flammable hydrocarbon oil used as fuel in lamps and heaters	a flammable hydrocarbon oil used as fuel in lamps and heaters