Ulmus pumila vs Siberian elm

Ulmus pumila and Siberian elm both are nouns.

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

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

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

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

Ulmus pumila (noun)	Siberian 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