Ulmus serotina vs red elm

Ulmus serotina and red elm both are nouns.

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

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

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

Other synonyms of Ulmus serotina include September elm.

Ulmus serotina (noun)	red elm (noun)
autumn-flowering elm of southeastern United States	North American elm having rough leaves that are red when opening; yields a hard wood
	autumn-flowering elm of southeastern United States