Cynoglossum virginaticum vs hound's-tongue

Cynoglossum virginaticum and hound's-tongue both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cynoglossum virginaticum	Yes	No	No	No
hound's-tongue	Yes	No	No	No

As nouns, Cynoglossum virginaticum and hound's-tongue are synonyms defined as:

Cynoglossum virginaticum and hound's-tongue: perennial shrub of North America having coarse tongue-shaped leaves and pale-blue to purple flowers

Cynoglossum virginaticum (noun)	hound's-tongue (noun)
perennial shrub of North America having coarse tongue-shaped leaves and pale-blue to purple flowers	biennial shrub of Europe and western Asia having coarse tongue-shaped leaves and dark reddish-purple flowers
	perennial shrub of North America having coarse tongue-shaped leaves and pale-blue to purple flowers