naming vs co-optation

naming and co-optation both are nouns.

Word	Noun	Adjective	Verb	Adverb
naming	Yes	Yes	No	No
co-optation	Yes	No	No	No

As nouns, co-optation is a hyponym of naming; that is, co-optation is a word with a more specific, narrower meaning than naming:

naming: the act of putting a person into a non-elective position
co-optation: the act of appointing summarily (with or without the appointee's consent)

Other hyponyms of naming include nomination, co-option, delegacy, ordinance, ordination, recognition.

naming (noun)	co-optation (noun)
the act of putting a person into a non-elective position	the selection of a new member (usually by a vote of the existing membership)
the verbal act of naming	the act of appointing summarily (with or without the appointee's consent)

naming (adjective)	co-optation (adjective)
inclined to or serving for the giving of names