Dutch elm vs elm

Dutch elm and elm both are nouns.

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

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

Dutch elm: any of various hybrid ornamental European shade trees ranging from dwarf to tall
elm: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of Dutch elm include elm tree.

Dutch elm (noun)	elm (noun)
any of various hybrid ornamental European shade trees ranging from dwarf to tall	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