writing vs fabrication

writing and fabrication both are nouns.

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

As nouns, fabrication is a hyponym of writing; that is, fabrication is a word with a more specific, narrower meaning than writing:

writing (noun)	fabrication (noun)
the activity of putting something in written form	the act of making something (a product) from raw materials
the act of creating written works	the act of constructing something (as a piece of machinery)
the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)	writing in a fictional form
letters or symbols that are written or imprinted on a surface to represent the sounds or words of a language	the deliberate act of deviating from the truth
(usually plural) the collected work of an author	a deliberately false or improbable account