September elm vs Ulmus serotina

September elm and Ulmus serotina both are nouns.

Word	Noun	Adjective	Verb	Adverb
September elm	Yes	No	No	No
Ulmus serotina	Yes	No	No	No

As nouns, September elm and Ulmus serotina are synonyms defined as:

September elm and Ulmus serotina: autumn-flowering elm of southeastern United States

Other synonyms of September elm include red elm.

September elm (noun)	Ulmus serotina (noun)
autumn-flowering elm of southeastern United States	autumn-flowering elm of southeastern United States