article vs nonfiction

article and nonfiction both are nouns.

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

As nouns, nonfiction is a hypernym of article; that is, nonfiction is a word with a broader meaning than article:

Other hypernyms of article include piece, nonfictional prose.

article (noun)	nonfiction (noun)
one of a class of artifacts	prose writing that is not fictional
nonfictional prose forming an independent part of a publication
(grammar) a determiner that may indicate the specificity of reference of a noun phrase
a separate section of a legal document (as a statute or contract or will)

article (verb)	nonfiction (verb)
bind by a contract; especially for a training period