failure vs insolvent

failure and insolvent both are nouns.

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

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

Other hyponyms of failure include bankrupt, flash in the pan, dud, flop, washout, underdog.

failure (noun)	insolvent (noun)
an act that fails	someone who has insufficient assets to cover their debts
an unexpected omission
an event that does not accomplish its intended purpose
a person with a record of failing; someone who loses consistently
lack of success
loss of ability to function normally
inability to discharge all your debts as they come due

failure (adjective)	insolvent (adjective)
	unable to meet or discharge financial obligations