American dogwood vs cornel

American dogwood and cornel both are nouns.

Word	Noun	Adjective	Verb	Adverb
American dogwood	Yes	No	No	No
cornel	Yes	No	No	No

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

American dogwood: common North American shrub with reddish purple twigs and white flowers
cornel: a tree of shrub of the genus Cornus often having showy bracts resembling flowers

Other hypernyms of American dogwood include dogwood, dogwood tree.

American dogwood (noun)	cornel (noun)
common North American shrub with reddish purple twigs and white flowers	a tree of shrub of the genus Cornus often having showy bracts resembling flowers