purpleness vs mauve

purpleness and mauve both are nouns.

Word	Noun	Adjective	Verb	Adverb
purpleness	Yes	No	No	No
mauve	Yes	Yes	No	No

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

Other hyponyms of purpleness include lavender, reddish purple, royal purple, reddish blue, violet.

purpleness (noun)	mauve (noun)
a color between red and blue	a moderate purple

purpleness (adjective)	mauve (adjective)
	of a pale to moderate greyish violet color