historiography vs writing

historiography and writing both are nouns.

Word	Noun	Adjective	Verb	Adverb
historiography	Yes	No	No	No
writing	Yes	No	No	No

As nouns, writing is a hypernym of historiography; that is, writing is a word with a broader meaning than historiography:

Other hypernyms of historiography include authorship, composition, penning.

historiography (noun)	writing (noun)
the writing of history	the activity of putting something in written form
a body of historical literature	the act of creating written works
	the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)
	letters or symbols that are written or imprinted on a surface to represent the sounds or words of a language
	(usually plural) the collected work of an author