purple vs lavender

purple and lavender both are nouns.

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

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

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

purple (noun)	lavender (noun)
(Roman Catholic Church) official dress of a cardinal; so named after the Tyrial purple color of the robes	a pale purple color
a color between red and blue	any of various Old World aromatic shrubs or subshrubs with usually mauve or blue flowers; widely cultivated
(in ancient Rome) position of imperial status

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

purple (verb)	lavender (verb)
color purple
become purple