Veronica agrestis vs speedwell

Veronica agrestis and speedwell both are nouns.

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

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

Veronica agrestis: European plant with minute axillary blue flowers on long stalks; widely naturalized in America
speedwell: any plant of the genus Veronica

Other hypernyms of Veronica agrestis include veronica.

Veronica agrestis (noun)	speedwell (noun)
European plant with minute axillary blue flowers on long stalks; widely naturalized in America	any plant of the genus Veronica