common speedwell vs veronica

common speedwell and veronica both are nouns.

Word	Noun	Adjective	Verb	Adverb
common speedwell	Yes	No	No	No
veronica	Yes	No	No	No

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

common speedwell: common hairy European perennial with pale blue or lilac flowers in axillary racemes
veronica: any plant of the genus Veronica

Other hypernyms of common speedwell include speedwell.

common speedwell (noun)	veronica (noun)
common hairy European perennial with pale blue or lilac flowers in axillary racemes	any plant of the genus Veronica