default vs delinquency

default and delinquency both are nouns.

Word	Noun	Adjective	Verb	Adverb
default	Yes	No	Yes	No
delinquency	Yes	No	No	No

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

default (noun)	delinquency (noun)
loss due to not showing up	an antisocial misdeed in violation of the law by a minor
an option that is selected automatically unless an alternative is specified	a tendency to be negligent and uncaring
loss resulting from failure of a debt to be paid	nonpayment of a debt when due
act of failing to meet a financial obligation

default (verb)	delinquency (verb)
fail to pay up