European elm vs elm

European elm and elm both are nouns.

Word	Noun	Adjective	Verb	Adverb
European elm	Yes	No	No	No
elm	Yes	No	No	No

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

European elm: 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 European elm include elm tree.

European elm (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