velvet plant vs royal velvet plant

velvet plant and royal velvet plant both are nouns.

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

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

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

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

velvet plant (noun)	royal 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