common white dogwood vs cornel

common white dogwood and cornel both are nouns.

Word	Noun	Adjective	Verb	Adverb
common white dogwood	Yes	No	No	No
cornel	Yes	No	No	No

As nouns, cornel is a hypernym of common white dogwood; that is, cornel is a word with a broader meaning than common white dogwood:

common white dogwood: deciduous tree; celebrated for its large white or pink bracts and stunning autumn color that is followed by red berries
cornel: a tree of shrub of the genus Cornus often having showy bracts resembling flowers

Other hypernyms of common white dogwood include dogwood, dogwood tree.

common white dogwood (noun)	cornel (noun)
deciduous tree; celebrated for its large white or pink bracts and stunning autumn color that is followed by red berries	a tree of shrub of the genus Cornus often having showy bracts resembling flowers