failure vs loss

failure and loss both are nouns.

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

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

failure (noun)	loss (noun)
an act that fails	the act of losing someone or something
an unexpected omission	the disadvantage that results from losing something
an event that does not accomplish its intended purpose	military personnel lost by death or capture
a person with a record of failing; someone who loses consistently	the experience of losing a loved one
lack of success	euphemistic expressions for death
loss of ability to function normally	the amount by which the cost of a business exceeds its revenue
inability to discharge all your debts as they come due	something that is lost
	gradual decline in amount or activity