casting vs surf fishing

casting and surf fishing both are nouns.

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

As nouns, surf fishing is a hyponym of casting; that is, surf fishing is a word with a more specific, narrower meaning than casting:

casting: the act of throwing a fishing line out over the water by means of a rod and reel
surf fishing: casting (artificial) bait far out into the ocean (up to 200 yards) with the waves breaking around you

Other hyponyms of casting include bait casting, fly casting, overcast, surf casting.

casting (noun)	surf fishing (noun)
the act of creating something by casting it in a mold	casting (artificial) bait far out into the ocean (up to 200 yards) with the waves breaking around you
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