extraneousness vs unrelatedness

extraneousness and unrelatedness both are nouns.

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

As nouns, unrelatedness is a hypernym of extraneousness; that is, unrelatedness is a word with a broader meaning than extraneousness:

extraneousness: unrelatedness by virtue of falling outside the matter at hand
unrelatedness: the lack of any particular manner of connectedness

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