casualty vs decrease

casualty and decrease both are nouns.

Word	Noun	Adjective	Verb	Adverb
casualty	Yes	No	No	No
decrease	Yes	No	Yes	No

As nouns, decrease is a hypernym of casualty; that is, decrease is a word with a broader meaning than casualty:

Other hypernyms of casualty include drop-off, lessening.

casualty (noun)	decrease (noun)
a decrease of military personnel or equipment	the act of decreasing or reducing something
an accident that causes someone to die	the amount by which something decreases
someone injured or killed in an accident	a change downward
someone injured or killed or captured or missing in a military engagement	a process of becoming smaller or shorter

casualty (verb)	decrease (verb)
	decrease in size, extent, or range
	make become smaller