Centranthus ruber vs red valerian

Centranthus ruber and red valerian both are nouns.

Word	Noun	Adjective	Verb	Adverb
Centranthus ruber	Yes	No	No	No
red valerian	Yes	No	No	No

As nouns, Centranthus ruber and red valerian are synonyms defined as:

Centranthus ruber and red valerian: European herb with small fragrant crimson or white spurred flowers

Other synonyms of Centranthus ruber include French honeysuckle.

Centranthus ruber (noun)	red valerian (noun)
European herb with small fragrant crimson or white spurred flowers	European herb with small fragrant crimson or white spurred flowers