rock candy vs candy

rock candy and candy both are nouns.

Word	Noun	Adjective	Verb	Adverb
rock candy	Yes	No	No	No
candy	Yes	No	Yes	No

As nouns, candy is a hypernym of rock candy; that is, candy is a word with a broader meaning than rock candy:

rock candy: sugar in large hard clear crystals on a string
candy: a rich sweet made of flavored sugar and often combined with fruit or nuts

Other hypernyms of rock candy include confect.

As nouns, candy is a hypernym of rock candy; that is, candy is a word with a broader meaning than rock candy:

rock candy: hard bright-colored stick candy (typically flavored with peppermint)
candy: a rich sweet made of flavored sugar and often combined with fruit or nuts

Other hypernyms of rock candy include confect.

rock candy (noun)	candy (noun)
sugar in large hard clear crystals on a string	a rich sweet made of flavored sugar and often combined with fruit or nuts
hard bright-colored stick candy (typically flavored with peppermint)

rock candy (verb)	candy (verb)
	coat with something sweet, such as a hard sugar glaze