text editor vs copyreader

text editor and copyreader both are nouns.

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

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

Other synonyms of text editor include copy editor.

text editor (noun)	copyreader (noun)
(computer science) an application that can be used to create and view and edit text files	an editor who prepares text for publication
an editor who prepares text for publication