Veronicastrum virginicum vs Culver's root

Veronicastrum virginicum and Culver's root both are nouns.

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

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

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

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

Veronicastrum virginicum (noun)	Culver's root (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