Ulmus glabra vs elm tree

Ulmus glabra and elm tree both are nouns.

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

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

Ulmus glabra: Eurasian elm often planted as a shade tree
elm tree: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of Ulmus glabra include elm.

Ulmus glabra (noun)	elm tree (noun)
Eurasian elm often planted as a shade tree	any of various trees of the genus Ulmus: important timber or shade trees