Culver's root vs Veronicastrum virginicum

Culver's root and Veronicastrum virginicum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Culver's root	Yes	No	No	No
Veronicastrum virginicum	Yes	No	No	No

As nouns, Culver's root and Veronicastrum virginicum are synonyms defined as:

Culver's root and Veronicastrum virginicum: a tall perennial herb having spikes of small white or purple flowers; common in eastern North America

Other synonyms of Culver's root include Culver's physic, Culvers physic, Culvers root, whorlywort.

Culver's root (noun)	Veronicastrum virginicum (noun)
a tall perennial herb having spikes of small white or purple flowers; common in eastern North America	a tall perennial herb having spikes of small white or purple flowers; common in eastern North America