ms vs written material

ms and written material both are nouns.

Word	Noun	Adjective	Verb	Adverb
ms	Yes	No	No	No
written material	Yes	No	No	No

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

ms: the form of a literary work submitted for publication
written material: the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)

Other hypernyms of ms include piece of writing, writing.

ms (noun)	written material (noun)
the form of a literary work submitted for publication	the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)