velvet plant vs purple velvet plant

velvet plant and purple velvet plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
velvet plant	Yes	No	No	No
purple velvet plant	Yes	No	No	No

As nouns, velvet plant and purple velvet plant are synonyms defined as:

velvet plant and purple velvet plant: Javanese foliage plant grown for their handsome velvety leaves with violet-purple hairs

Other synonyms of velvet plant include Gynura aurantiaca, royal velvet plant.

velvet plant (noun)	purple velvet plant (noun)
Javanese foliage plant grown for their handsome velvety leaves with violet-purple hairs	Javanese foliage plant grown for their handsome velvety leaves with violet-purple hairs
any of various plants of the genus Verbascum having large usually woolly leaves and terminal spikes of yellow or white or purplish flowers