desert plant vs agave

desert plant and agave both are nouns.

Word	Noun	Adjective	Verb	Adverb
desert plant	Yes	No	No	No
agave	Yes	No	No	No

As nouns, agave is a hyponym of desert plant; that is, agave is a word with a more specific, narrower meaning than desert plant:

desert plant: plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte
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 hyponyms of desert plant include American aloe, century plant.

desert plant (noun)	agave (noun)
plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte	tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber