editing vs excision

editing and excision both are nouns.

Word	Noun	Adjective	Verb	Adverb
editing	Yes	No	No	No
excision	Yes	No	No	No

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

editing: putting something (as a literary work or a legislative bill) into acceptable form
excision: the omission that is made when an editorial change shortens a written passage

Other hyponyms of editing include copy editing, cut, deletion, correction, revising, rewriting.

editing (noun)	excision (noun)
putting something (as a literary work or a legislative bill) into acceptable form	surgical removal of a body part or tissue
	the act of pulling up or out; uprooting; cutting off from existence
	the act of banishing a member of a church from the communion of believers and the privileges of the church; cutting a person off from a religious society
	the omission that is made when an editorial change shortens a written passage