Cornus sanguinea vs dogwood

Cornus sanguinea and dogwood both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cornus sanguinea	Yes	No	No	No
dogwood	Yes	No	No	No

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

Cornus sanguinea: European deciduous shrub turning red in autumn having dull white flowers
dogwood: a tree of shrub of the genus Cornus often having showy bracts resembling flowers

Other hypernyms of Cornus sanguinea include cornel, dogwood tree.

Cornus sanguinea (noun)	dogwood (noun)
European deciduous shrub turning red in autumn having dull white flowers	a tree of shrub of the genus Cornus often having showy bracts resembling flowers
	hard tough wood of any dogwood of the genus Cornus; resembles boxwood