kerosene heater vs oil heater

kerosene heater and oil heater both are nouns.

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

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

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

Other synonyms of kerosene heater include kerosine heater, oilstove.

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