editing vs deletion

editing and deletion both are nouns.

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

As nouns, deletion is a hyponym of editing; that is, deletion 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
deletion: the omission that is made when an editorial change shortens a written passage

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

editing (noun)	deletion (noun)
putting something (as a literary work or a legislative bill) into acceptable form	the act of deleting something written or printed
	the omission that is made when an editorial change shortens a written passage
	(genetics) the loss or absence of one or more nucleotides from a chromosome
	any process whereby sounds or words are left out of spoken words or phrases