Ulmus serotina vs September elm

Ulmus serotina and September elm both are nouns.

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

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

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

Other synonyms of Ulmus serotina include red elm.

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