loss vs casualty

loss and casualty both are nouns.

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

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

loss (noun)	casualty (noun)
the act of losing someone or something	a decrease of military personnel or equipment
the disadvantage that results from losing something	an accident that causes someone to die
military personnel lost by death or capture	someone injured or killed in an accident
the experience of losing a loved one	someone injured or killed or captured or missing in a military engagement
euphemistic expressions for death
the amount by which the cost of a business exceeds its revenue
something that is lost
gradual decline in amount or activity