dracaena vs agave

dracaena and agave both are nouns.

Word	Noun	Adjective	Verb	Adverb
dracaena	Yes	No	No	No
agave	Yes	No	No	No

As nouns, agave is a hypernym of dracaena; that is, agave is a word with a broader meaning than dracaena:

dracaena: an agave that is often cultivated for its decorative foliage
agave: 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 dracaena include American aloe, century plant.

dracaena (noun)	agave (noun)
an agave that is often cultivated for its decorative foliage	tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber