Agave sisalana vs American aloe

Agave sisalana and American aloe both are nouns.

Word	Noun	Adjective	Verb	Adverb
Agave sisalana	Yes	No	No	No
American aloe	Yes	No	No	No

As nouns, American aloe is a hypernym of Agave sisalana; that is, American aloe is a word with a broader meaning than Agave sisalana:

Agave sisalana: Mexican or West Indian plant with large fleshy leaves yielding a stiff fiber used in e.g. rope
American aloe: tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber

Other hypernyms of Agave sisalana include agave, century plant.

Agave sisalana (noun)	American aloe (noun)
Mexican or West Indian plant with large fleshy leaves yielding a stiff fiber used in e.g. rope	tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber