winged elm vs elm tree

winged elm and elm tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
winged elm	Yes	No	No	No
elm tree	Yes	No	No	No

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

winged elm: North American elm having twigs and young branches with prominent corky projections
elm tree: any of various trees of the genus Ulmus: important timber or shade trees

Other hypernyms of winged elm include elm.

winged elm (noun)	elm tree (noun)
North American elm having twigs and young branches with prominent corky projections	any of various trees of the genus Ulmus: important timber or shade trees