extraneous vs extraneousness

extraneous is not a noun while extraneousness is a noun.

Word	Noun	Adjective	Verb	Adverb
extraneous	No	Yes	No	No
extraneousness	Yes	No	No	No

extraneous (noun)	extraneousness (noun)
	The state of not forming an essential or vital part.
	unrelatedness by virtue of falling outside the matter at hand

extraneous (adjective)	extraneousness (adjective)
not belonging to that in which it is contained; introduced from an outside source
not pertinent to the matter under consideration
coming from the outside
not essential