decrease vs casualty

decrease and casualty both are nouns.

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

As nouns, casualty is a hyponym of decrease; that is, casualty is a word with a more specific, narrower meaning than decrease:

Other hyponyms of decrease include shrinkage, shrinking, sinking, attrition, rarefaction, dwindling, dwindling away, waning.

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

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