Veronica agrestis vs veronica

Veronica agrestis and veronica both are nouns.

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

As nouns, veronica is a hypernym of Veronica agrestis; that is, veronica 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
veronica: any plant of the genus Veronica

Other hypernyms of Veronica agrestis include speedwell.

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