chinquapin vs Castanea pumila

chinquapin and Castanea pumila both are nouns.

Word	Noun	Adjective	Verb	Adverb
chinquapin	Yes	No	No	No
Castanea pumila	Yes	No	No	No

As nouns, chinquapin and Castanea pumila are synonyms defined as:

chinquapin and Castanea pumila: shrubby chestnut tree of southeastern United States having small edible nuts

Other synonyms of chinquapin include Allegheny chinkapin, dwarf chestnut, eastern chinquapin.

chinquapin (noun)	Castanea pumila (noun)
small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut	shrubby chestnut tree of southeastern United States having small edible nuts
shrubby chestnut tree of southeastern United States having small edible nuts
shrubby tree closely related to the Allegheny chinkapin but with larger leaves; southern midwestern United States