Culver's root vs whorlywort

Culver's root and whorlywort both are nouns.

Word	Noun	Adjective	Verb	Adverb
Culver's root	Yes	No	No	No
whorlywort	Yes	No	No	No

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

Culver's root and whorlywort: 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, Veronicastrum virginicum.

Culver's root (noun)	whorlywort (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