American chestnut vs American sweet chestnut

American chestnut and American sweet chestnut both are nouns.

Word	Noun	Adjective	Verb	Adverb
American chestnut	Yes	No	No	No
American sweet chestnut	Yes	No	No	No

As nouns, American chestnut and American sweet chestnut are synonyms defined as:

American chestnut and American sweet chestnut: large tree found from Maine to Alabama

Other synonyms of American chestnut include Castanea dentata.

American chestnut (noun)	American sweet chestnut (noun)
large tree found from Maine to Alabama	large tree found from Maine to Alabama