Jersey elm vs elm

Jersey elm and elm both are nouns.

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

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

Jersey elm: a variety of the English elm with erect branches and broader leaves
elm: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of Jersey elm include elm tree.

Jersey elm (noun)	elm (noun)
a variety of the English elm with erect branches and broader leaves	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