willful neglect vs delinquency

willful neglect and delinquency both are nouns.

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

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

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

Other synonyms of willful neglect include dereliction.

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