Carya glabra vs pignut

Carya glabra and pignut both are nouns.

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

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

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

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