Culvers physic vs Culver's physic

Culvers physic and Culver's physic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Culvers physic	Yes	No	No	No
Culver's physic	Yes	No	No	No

As nouns, Culvers physic and Culver's physic are synonyms defined as:

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

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

Culvers physic (noun)	Culver's physic (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