editing vs copy editing

editing and copy editing both are nouns.

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

As nouns, copy editing is a hyponym of editing; that is, copy editing 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
copy editing: putting something into a form suitable for a printer

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

editing (noun)	copy editing (noun)
putting something (as a literary work or a legislative bill) into acceptable form	putting something into a form suitable for a printer