candy apple vs caramel apple

candy apple and caramel apple both are nouns.

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

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

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

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

candy apple (noun)	caramel 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)