Ulmus parvifolia vs elm

Ulmus parvifolia and elm both are nouns.

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

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

Ulmus parvifolia: small fast-growing tree native to Asia; widely grown as shelterbelts and hedges
elm: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of Ulmus parvifolia include elm tree.

Ulmus parvifolia (noun)	elm (noun)
small fast-growing tree native to Asia; widely grown as shelterbelts and hedges	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