Fraxinus latifolia vs ash tree

Fraxinus latifolia and ash tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fraxinus latifolia	Yes	No	No	No
ash tree	Yes	No	No	No

As nouns, ash tree is a hypernym of Fraxinus latifolia; that is, ash tree is a word with a broader meaning than Fraxinus latifolia:

Fraxinus latifolia: timber tree of western North America yielding hard light wood; closely related to the red ash
ash tree: any of various deciduous pinnate-leaved ornamental or timber trees of the genus Fraxinus

Other hypernyms of Fraxinus latifolia include ash.

Fraxinus latifolia (noun)	ash tree (noun)
timber tree of western North America yielding hard light wood; closely related to the red ash	any of various deciduous pinnate-leaved ornamental or timber trees of the genus Fraxinus