Cornus stolonifera vs cornel

Cornus stolonifera and cornel both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cornus stolonifera	Yes	No	No	No
cornel	Yes	No	No	No

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

Cornus stolonifera: 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 Cornus stolonifera include dogwood, dogwood tree.

Cornus stolonifera (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