copyreader vs copy editor

copyreader and copy editor both are nouns.

Word	Noun	Adjective	Verb	Adverb
copyreader	Yes	No	No	No
copy editor	Yes	No	No	No

As nouns, copyreader and copy editor are synonyms defined as:

Other synonyms of copyreader include text editor.

copyreader (noun)	copy editor (noun)
an editor who prepares text for publication	an editor who prepares text for publication