nobility vs the purple

nobility and the purple both are nouns.

Word	Noun	Adjective	Verb	Adverb
nobility	Yes	No	No	No
the purple	Yes	No	No	No

As nouns, the purple is a hyponym of nobility; that is, the purple is a word with a more specific, narrower meaning than nobility:

Other hyponyms of nobility include purple.

nobility (noun)	the purple (noun)
the quality of elevation of mind and exaltation of character or ideals or conduct	(Roman Catholic Church) official dress of a cardinal; so named after the Tyrial purple color of the robes
a privileged class holding hereditary titles	(in ancient Rome) position of imperial status
the state of being of noble birth