Vinca minor vs periwinkle

Vinca minor and periwinkle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vinca minor	Yes	No	No	No
periwinkle	Yes	No	No	No

As nouns, periwinkle is a hypernym of Vinca minor; that is, periwinkle is a word with a broader meaning than Vinca minor:

Vinca minor: widely cultivated as a groundcover for its dark green shiny leaves and usually blue-violet flowers
periwinkle: chiefly trailing poisonous plants with blue flowers

Vinca minor (noun)	periwinkle (noun)
widely cultivated as a groundcover for its dark green shiny leaves and usually blue-violet flowers	edible marine gastropod
	small edible marine snail; steamed in wine or baked
	chiefly trailing poisonous plants with blue flowers
	commonly cultivated Old World woody herb having large pinkish to red flowers