omission vs disregard

omission and disregard both are nouns.

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

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

Other hypernyms of omission include neglect.

omission (noun)	disregard (noun)
a mistake resulting from neglect	willful lack of care and attention
neglecting to do something; leaving out or passing over something	lack of attention and due care
any process whereby sounds or words are left out of spoken words or phrases
something that has been omitted

omission (verb)	disregard (verb)
	give little or no attention to
	bar from attention or consideration
	refuse to acknowledge