casting vs sportfishing

casting and sportfishing both are nouns.

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

As nouns, sportfishing is a hypernym of casting; that is, sportfishing 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
sportfishing: the act of someone who fishes as a diversion

Other hypernyms of casting include fishing.

casting (noun)	sportfishing (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 choice of actors to play particular roles in a play or movie
object formed by a mold