frosting vs icing

frosting and icing both are nouns.

Word	Noun	Adjective	Verb	Adverb
frosting	Yes	No	No	No
icing	Yes	No	No	No

As nouns, frosting and icing are synonyms defined as:

frosting and icing: a flavored sugar topping used to coat and decorate cakes

Other synonyms of frosting include ice.

frosting (noun)	icing (noun)
a flavored sugar topping used to coat and decorate cakes	(ice hockey) the act of shooting the puck from within your own defensive area the length of the rink beyond the opponent's goal
	a flavored sugar topping used to coat and decorate cakes
	the formation of frost or ice on a surface