preamble vs written document

preamble and written document both are nouns.

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

preamble (noun)	written document (noun)
a preliminary introduction to a statute or constitution (usually explaining its purpose)	writing that provides information (especially information of an official nature)

preamble (verb)	written document (verb)
make a preliminary introduction, usually to a formal document