defroster vs deicer

defroster and deicer both are nouns.

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

As nouns, defroster and deicer are synonyms defined as:

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

defroster (noun)	deicer (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)