delinquency vs willful neglect

delinquency and willful neglect both are nouns.

Word	Noun	Adjective	Verb	Adverb
delinquency	Yes	No	No	No
willful neglect	Yes	No	No	No

As nouns, delinquency and willful neglect are synonyms defined as:

delinquency and willful neglect: a tendency to be negligent and uncaring

Other synonyms of delinquency include dereliction.

delinquency (noun)	willful neglect (noun)
an antisocial misdeed in violation of the law by a minor	a tendency to be negligent and uncaring
a tendency to be negligent and uncaring
nonpayment of a debt when due