Ulmus laevis vs elm

Ulmus laevis and elm both are nouns.

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

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

Ulmus laevis: Eurasian elm closely resembling the American elm; thrives in a moist environment
elm: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of Ulmus laevis include elm tree.

Ulmus laevis (noun)	elm (noun)
Eurasian elm closely resembling the American elm; thrives in a moist environment	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