casting vs fishing

casting and fishing both are nouns.

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

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

casting: the act of throwing a fishing line out over the water by means of a rod and reel
fishing: the act of someone who fishes as a diversion

Other hypernyms of casting include sportfishing.

casting (noun)	fishing (noun)
the act of creating something by casting it in a mold	the act of someone who fishes as a diversion
the act of throwing a fishing line out over the water by means of a rod and reel	the occupation of catching fish for a living
the choice of actors to play particular roles in a play or movie
object formed by a mold