omission vs omit

omission is a noun but omit is not a noun.

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

omission (noun)	omit (noun)
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

omission (verb)	omit (verb)
	leave undone or leave out
	prevent from being included or considered or accepted