bluishness vs blueness

bluishness and blueness both are nouns.

Word	Noun	Adjective	Verb	Adverb
bluishness	Yes	No	No	No
blueness	Yes	No	No	No

As nouns, blueness is a hypernym of bluishness; that is, blueness is a word with a broader meaning than bluishness:

bluishness: The quality of being somewhat blue or having a tinge of blue.
blueness: blue color or pigment; resembling the color of the clear sky in the daytime

Other hypernyms of bluishness include blue.

bluishness (noun)	blueness (noun)
The quality of being somewhat blue or having a tinge of blue.	blue color or pigment; resembling the color of the clear sky in the daytime