zamia vs Zamia pumila

zamia and Zamia pumila both are nouns.

Word	Noun	Adjective	Verb	Adverb
zamia	Yes	No	No	No
Zamia pumila	Yes	No	No	No

As nouns, Zamia pumila is a hyponym of zamia; that is, Zamia pumila is a word with a more specific, narrower meaning than zamia:

zamia: any of various cycads of the genus Zamia; among the smallest and most verdant cycads
Zamia pumila: small tough woody zamia of Florida and West Indies and Cuba; roots and half-buried stems yield an arrowroot

Other hyponyms of zamia include coontie, Florida arrowroot, Seminole bread.

zamia (noun)	Zamia pumila (noun)
any of various cycads of the genus Zamia; among the smallest and most verdant cycads	small tough woody zamia of Florida and West Indies and Cuba; roots and half-buried stems yield an arrowroot