papyrus vs written document

papyrus and written document both are nouns.

Word	Noun	Adjective	Verb	Adverb
papyrus	Yes	No	No	No
written document	Yes	No	No	No

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

papyrus: a document written on papyrus
written document: writing that provides information (especially information of an official nature)

Other hypernyms of papyrus include document, papers.

papyrus (noun)	written document (noun)
a document written on papyrus	writing that provides information (especially information of an official nature)
tall sedge of the Nile valley yielding fiber that served many purposes in historic times
paper made from the papyrus plant by cutting it in strips and pressing it flat; used by ancient Egyptians and Greeks and Romans