Cornus mas vs dogwood tree

Cornus mas and dogwood tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cornus mas	Yes	No	No	No
dogwood tree	Yes	No	No	No

As nouns, dogwood tree is a hypernym of Cornus mas; that is, dogwood tree is a word with a broader meaning than Cornus mas:

Cornus mas: deciduous European shrub or small tree having bright red fruit
dogwood tree: a tree of shrub of the genus Cornus often having showy bracts resembling flowers

Other hypernyms of Cornus mas include cornel, dogwood.

Cornus mas (noun)	dogwood tree (noun)
deciduous European shrub or small tree having bright red fruit	a tree of shrub of the genus Cornus often having showy bracts resembling flowers