Agave americana vs American agave

Agave americana and American agave both are nouns.

Word	Noun	Adjective	Verb	Adverb
Agave americana	Yes	No	No	No
American agave	Yes	No	No	No

As nouns, Agave americana and American agave are synonyms defined as:

Agave americana and American agave: widely cultivated American monocarpic plant with greenish-white flowers on a tall stalk; blooms only after ten to twenty years and then dies

Agave americana (noun)	American agave (noun)
widely cultivated American monocarpic plant with greenish-white flowers on a tall stalk; blooms only after ten to twenty years and then dies	widely cultivated American monocarpic plant with greenish-white flowers on a tall stalk; blooms only after ten to twenty years and then dies