copyreader vs editor in chief

copyreader and editor in chief both are nouns.

Word	Noun	Adjective	Verb	Adverb
copyreader	Yes	No	No	No
editor in chief	Yes	No	No	No

As nouns, editor in chief is a hypernym of copyreader; that is, editor in chief is a word with a broader meaning than copyreader:

copyreader: an editor who prepares text for publication
editor in chief: a person responsible for the editorial aspects of publication; the person who determines the final content of a text (especially of a newspaper or magazine)

Other hypernyms of copyreader include editor.

copyreader (noun)	editor in chief (noun)
an editor who prepares text for publication	a person responsible for the editorial aspects of publication; the person who determines the final content of a text (especially of a newspaper or magazine)