common speedwell vs Veronica officinalis

common speedwell and Veronica officinalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
common speedwell	Yes	No	No	No
Veronica officinalis	Yes	No	No	No

As nouns, common speedwell and Veronica officinalis are synonyms defined as:

common speedwell and Veronica officinalis: common hairy European perennial with pale blue or lilac flowers in axillary racemes

Other synonyms of common speedwell include gypsyweed.

common speedwell (noun)	Veronica officinalis (noun)
common hairy European perennial with pale blue or lilac flowers in axillary racemes	common hairy European perennial with pale blue or lilac flowers in axillary racemes