Madagascar periwinkle vs Catharanthus roseus

Madagascar periwinkle and Catharanthus roseus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Madagascar periwinkle	Yes	No	No	No
Catharanthus roseus	Yes	No	No	No

As nouns, Madagascar periwinkle and Catharanthus roseus are synonyms defined as:

Madagascar periwinkle and Catharanthus roseus: commonly cultivated Old World woody herb having large pinkish to red flowers

Other synonyms of Madagascar periwinkle include Cape periwinkle, cayenne jasmine, old maid, periwinkle, red periwinkle, rose periwinkle, Vinca rosea.

Madagascar periwinkle (noun)	Catharanthus roseus (noun)
commonly cultivated Old World woody herb having large pinkish to red flowers	commonly cultivated Old World woody herb having large pinkish to red flowers