casting vs option

casting and option both are nouns.

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

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

Other hypernyms of casting include choice, pick, selection.

casting (noun)	option (noun)
the act of creating something by casting it in a mold	the act of choosing or selecting
the act of throwing a fishing line out over the water by means of a rod and reel	one of a number of things from which only one can be chosen
the choice of actors to play particular roles in a play or movie	the right to buy or sell property at an agreed price; the right is purchased and if it is not exercised by a stated date the money is forfeited
object formed by a mold