cryptography vs writing

cryptography and writing both are nouns.

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

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

Other hypernyms of cryptography include committal to writing.

cryptography (noun)	writing (noun)
act of writing in code or cipher	the activity of putting something in written form
the science of analyzing and deciphering codes and ciphers and cryptograms	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