oil heater vs kerosene heater

oil heater and kerosene heater both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil heater	Yes	No	No	No
kerosene heater	Yes	No	No	No

As nouns, oil heater and kerosene heater are synonyms defined as:

oil heater and kerosene heater: heater that burns oil (as kerosine) for heating or cooking

Other synonyms of oil heater include kerosine heater, oilstove.

oil heater (noun)	kerosene heater (noun)
heater that burns oil (as kerosine) for heating or cooking	heater that burns oil (as kerosine) for heating or cooking