American agave vs Agave americana

American agave and Agave americana both are nouns.

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

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

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

American agave (noun)	Agave americana (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