document vs article

document and article both are nouns.

Word	Noun	Adjective	Verb	Adverb
document	Yes	No	Yes	No
article	Yes	No	Yes	No

document (noun)	article (noun)
anything serving as a representation of a person's thinking by means of symbolic marks	one of a class of artifacts
writing that provides information (especially information of an official nature)	nonfictional prose forming an independent part of a publication
(computer science) a computer file that contains text (and possibly formatting instructions) using seven-bit ASCII characters	(grammar) a determiner that may indicate the specificity of reference of a noun phrase
a written account of ownership or obligation	a separate section of a legal document (as a statute or contract or will)

document (verb)	article (verb)
support or supply with references	bind by a contract; especially for a training period
record in detail