written matter vs text

written matter and text both are nouns.

Word	Noun	Adjective	Verb	Adverb
written matter	Yes	No	No	No
text	Yes	No	Yes	No

As nouns, text is a hypernym of written matter; that is, text is a word with a broader meaning than written matter:

Other hypernyms of written matter include textual matter.

written matter (noun)	text (noun)
matter to be printed; exclusive of graphical materials	the words of something written
	the main body of a written work (as distinct from illustrations or footnotes etc.)
	a book prepared for use in schools or colleges
	a passage from the Bible that is used as the subject of a sermon

written matter (verb)	text (verb)
	to send a message by SMS or similar text-based messaging service