death mask vs casting

death mask and casting both are nouns.

Word	Noun	Adjective	Verb	Adverb
death mask	Yes	No	No	No
casting	Yes	No	No	No

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

Other hypernyms of death mask include cast.

death mask (noun)	casting (noun)
a cast taken from the face of a dead person	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