Ulmus procera vs elm

Ulmus procera and elm both are nouns.

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

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

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

Other hypernyms of Ulmus procera include elm tree.

Ulmus procera (noun)	elm (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
	hard tough wood of an elm tree; used for e.g. implements and furniture