Veronica americana vs American brooklime

Veronica americana and American brooklime both are nouns.

Word	Noun	Adjective	Verb	Adverb
Veronica americana	Yes	No	No	No
American brooklime	Yes	No	No	No

As nouns, Veronica americana and American brooklime are synonyms defined as:

Veronica americana and American brooklime: plant of western North America and northeastern Asia having prostrate stems with dense racemes of pale violet to lilac flowers

Other synonyms of Veronica americana include brooklime.

Veronica americana (noun)	American brooklime (noun)
plant of western North America and northeastern Asia having prostrate stems with dense racemes of pale violet to lilac flowers	plant of western North America and northeastern Asia having prostrate stems with dense racemes of pale violet to lilac flowers