golden mean vs moderateness

golden mean and moderateness both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden mean	Yes	No	No	No
moderateness	Yes	No	No	No

As nouns, moderateness is a hypernym of golden mean; that is, moderateness is a word with a broader meaning than golden mean:

Other hypernyms of golden mean include moderation.

golden mean (noun)	moderateness (noun)
the middle between extremes	quality of being moderate and avoiding extremes
the proportional relation between two divisions of line or two dimension of a plane figure such that short : long :: long : (short + long)	the property of being moderate in price or expenditures