Ulmus sarniensis vs elm

Ulmus sarniensis and elm both are nouns.

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

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

Ulmus sarniensis: 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 Ulmus sarniensis include elm tree.

Ulmus sarniensis (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