writing vs reference

writing and reference both are nouns.

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

writing (noun)	reference (noun)
the activity of putting something in written form	the act of referring or consulting
the act of creating written works	the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)	the relation between a word or phrase and the object or idea it refers to
letters or symbols that are written or imprinted on a surface to represent the sounds or words of a language	a formal recommendation by a former employer to a potential future employer describing the person's qualifications and dependability
(usually plural) the collected work of an author	a remark that calls attention to something or someone
	a short note recognizing a source of information or of a quoted passage
	a book to which you can refer for authoritative facts
	an indicator that orients you generally
	a publication (or a passage from a publication) that is referred to
	(computer science) the code that identifies where a piece of information is stored

writing (verb)	reference (verb)
	refer to