purple vs violet

purple and violet both are nouns.

Word	Noun	Adjective	Verb	Adverb
purple	Yes	Yes	Yes	No
violet	Yes	Yes	No	No

As adjectives, purple and violet are synonyms defined as:

Other synonyms of purple include purplish.

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

Other hyponyms of purple include lavender, mauve, reddish purple, royal purple, reddish blue.

purple (noun)	violet (noun)
(Roman Catholic Church) official dress of a cardinal; so named after the Tyrial purple color of the robes	a variable color that lies beyond blue in the spectrum
a color between red and blue	any of numerous low-growing violas with small flowers
(in ancient Rome) position of imperial status

purple (adjective)	violet (adjective)
of a color intermediate between red and blue	of a color intermediate between red and blue
belonging to or befitting a supreme ruler
excessively elaborate or showily expressed

purple (verb)	violet (verb)
color purple
become purple