fly casting vs casting

fly casting and casting both are nouns.

Word	Noun	Adjective	Verb	Adverb
fly casting	Yes	No	No	No
casting	Yes	No	No	No

As nouns, casting is a hypernym of fly casting; that is, casting is a word with a broader meaning than fly casting:

fly casting: casting an artificial fly as a lure
casting: the act of throwing a fishing line out over the water by means of a rod and reel

Other hypernyms of fly casting include cast.

fly casting (noun)	casting (noun)
casting an artificial fly as a lure	the act of creating something by casting it in a mold
	the act of throwing a fishing line out over the water by means of a rod and reel
	the choice of actors to play particular roles in a play or movie
	object formed by a mold