Veronica arvensis vs veronica

Veronica arvensis and veronica both are nouns.

Word	Noun	Adjective	Verb	Adverb
Veronica arvensis	Yes	No	No	No
veronica	Yes	No	No	No

As nouns, veronica is a hypernym of Veronica arvensis; that is, veronica is a word with a broader meaning than Veronica arvensis:

Veronica arvensis: erect or procumbent blue-flowered annual found in waste places of Europe and America
veronica: any plant of the genus Veronica

Other hypernyms of Veronica arvensis include speedwell.

Veronica arvensis (noun)	veronica (noun)
erect or procumbent blue-flowered annual found in waste places of Europe and America	any plant of the genus Veronica