omission vs neglect

omission and neglect both are nouns.

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

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

Other hypernyms of omission include disregard.

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

Other hypernyms of omission include disuse.

omission (noun)	neglect (noun)
a mistake resulting from neglect	failure to act with the prudence that a reasonable person would exercise under the same circumstances
neglecting to do something; leaving out or passing over something	willful lack of care and attention
any process whereby sounds or words are left out of spoken words or phrases	the trait of neglecting responsibilities and lacking concern
something that has been omitted	lack of attention and due care
	the state of something that has been unused and neglected

omission (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