disuse vs omission

disuse and omission both are nouns.

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

As nouns, omission is a hyponym of disuse; that is, omission is a word with a more specific, narrower meaning than disuse:

disuse (noun)	omission (noun)
the state of something that has been unused and neglected	a mistake resulting from neglect
	neglecting to do something; leaving out or passing over something
	any process whereby sounds or words are left out of spoken words or phrases
	something that has been omitted