purple velvet plant vs royal velvet plant

purple velvet plant and royal velvet plant both are nouns.

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

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

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

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

purple 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