pignut vs Carya glabra

pignut and Carya glabra both are nouns.

Word	Noun	Adjective	Verb	Adverb
pignut	Yes	No	No	No
Carya glabra	Yes	No	No	No

As nouns, pignut and Carya glabra are synonyms defined as:

Other synonyms of pignut include black hickory, brown hickory, pignut hickory.

pignut (noun)	Carya glabra (noun)
an American hickory tree having bitter nuts	an American hickory tree having bitter nuts