Anacyclus pyrethrum vs pellitory-of-Spain

Anacyclus pyrethrum and pellitory-of-Spain both are nouns.

Word	Noun	Adjective	Verb	Adverb
Anacyclus pyrethrum	Yes	No	No	No
pellitory-of-Spain	Yes	No	No	No

As nouns, Anacyclus pyrethrum and pellitory-of-Spain are synonyms defined as:

Anacyclus pyrethrum and pellitory-of-Spain: a small Mediterranean plant containing a volatile oil once used to relieve toothache

Other synonyms of Anacyclus pyrethrum include pellitory.

Anacyclus pyrethrum (noun)	pellitory-of-Spain (noun)
a small Mediterranean plant containing a volatile oil once used to relieve toothache	a small Mediterranean plant containing a volatile oil once used to relieve toothache