inclosure vs written document

inclosure and written document both are nouns.

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

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

inclosure: something (usually a supporting document) that is enclosed in an envelope with a covering letter
written document: writing that provides information (especially information of an official nature)

Other hypernyms of inclosure include document, papers.

inclosure (noun)	written document (noun)
the act of enclosing something inside something else	writing that provides information (especially information of an official nature)
something (usually a supporting document) that is enclosed in an envelope with a covering letter