deicer vs defroster

deicer and defroster both are nouns.

Word	Noun	Adjective	Verb	Adverb
deicer	Yes	No	No	No
defroster	Yes	No	No	No

As nouns, deicer and defroster are synonyms defined as:

deicer and defroster: heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane)

deicer (noun)	defroster (noun)
heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane)	heater that removes ice or frost (as from a windshield or a refrigerator or the wings of an airplane)