water elm vs elm

water elm and elm both are nouns.

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

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

water elm: large ornamental tree with graceful gradually spreading branches common in eastern North America
elm: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of water elm include elm tree.

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

water elm: Eurasian elm closely resembling the American elm; thrives in a moist environment
elm: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of water elm include elm tree.

water elm (noun)	elm (noun)
large ornamental tree with graceful gradually spreading branches common in eastern North America	any of various trees of the genus Ulmus: important timber or shade trees
Eurasian elm closely resembling the American elm; thrives in a moist environment	hard tough wood of an elm tree; used for e.g. implements and furniture