Ulmus pumila vs dwarf elm

Ulmus pumila and dwarf elm both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ulmus pumila	Yes	No	No	No
dwarf elm	Yes	No	No	No

As nouns, Ulmus pumila and dwarf elm are synonyms defined as:

Ulmus pumila and dwarf elm: fast-growing shrubby Asian tree naturalized in United States for shelter or ornament

Other synonyms of Ulmus pumila include Chinese elm, Siberian elm.

Ulmus pumila (noun)	dwarf elm (noun)
fast-growing shrubby Asian tree naturalized in United States for shelter or ornament	fast-growing shrubby Asian tree naturalized in United States for shelter or ornament