Veronica arvensis vs speedwell

Veronica arvensis and speedwell both are nouns.

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

As nouns, speedwell is a hypernym of Veronica arvensis; that is, speedwell 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
speedwell: any plant of the genus Veronica

Other hypernyms of Veronica arvensis include veronica.

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