Ulmus procera vs elm tree

Ulmus procera and elm tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ulmus procera	Yes	No	No	No
elm tree	Yes	No	No	No

As nouns, elm tree is a hypernym of Ulmus procera; that is, elm tree is a word with a broader meaning than Ulmus procera:

Ulmus procera: broad spreading rough-leaved elm common throughout Europe and planted elsewhere
elm tree: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of Ulmus procera include elm.

Ulmus procera (noun)	elm tree (noun)
broad spreading rough-leaved elm common throughout Europe and planted elsewhere	any of various trees of the genus Ulmus: important timber or shade trees