candy apple vs candied apple

candy apple and candied apple both are nouns.

Word	Noun	Adjective	Verb	Adverb
candy apple	Yes	No	No	No
candied apple	Yes	No	No	No

As nouns, candy apple and candied apple are synonyms defined as:

candy apple and candied apple: an apple that is covered with a candy-like substance (usually caramelized sugar)

Other synonyms of candy apple include caramel apple, taffy apple, toffee apple.

candy apple (noun)	candied apple (noun)
an apple that is covered with a candy-like substance (usually caramelized sugar)	an apple that is covered with a candy-like substance (usually caramelized sugar)