willful neglect vs neglect

willful neglect and neglect both are nouns.

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

As nouns, neglect is a hypernym of willful neglect; that is, neglect is a word with a broader meaning than willful neglect:

Other hypernyms of willful neglect include neglectfulness, negligence.

willful neglect (noun)	neglect (noun)
a tendency to be negligent and uncaring	failure to act with the prudence that a reasonable person would exercise under the same circumstances
	willful lack of care and attention
	the trait of neglecting responsibilities and lacking concern
	lack of attention and due care
	the state of something that has been unused and neglected

willful neglect (verb)	neglect (verb)
	leave undone or leave out
	give little or no attention to
	fail to attend to
	fail to do something; leave something undone