lexicography vs writing

lexicography and writing both are nouns.

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

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

Other hypernyms of lexicography include authorship, composition, penning.

lexicography (noun)	writing (noun)
the act of writing dictionaries	the activity of putting something in written form
	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