Sabal palmetto vs palmetto

Sabal palmetto and palmetto both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sabal palmetto	Yes	No	No	No
palmetto	Yes	No	No	No

As nouns, palmetto is a hypernym of Sabal palmetto; that is, palmetto is a word with a broader meaning than Sabal palmetto:

Sabal palmetto: low-growing fan-leaved palm of coastal southern United States having edible leaf buds
palmetto: any of several low-growing palms with fan-shaped leaves

Sabal palmetto (noun)	palmetto (noun)
low-growing fan-leaved palm of coastal southern United States having edible leaf buds	any of several low-growing palms with fan-shaped leaves