silky cornel vs dogwood tree

silky cornel and dogwood tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
silky cornel	Yes	No	No	No
dogwood tree	Yes	No	No	No

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

silky cornel: shrub of eastern North America having purplish stems and blue fruit
dogwood tree: a tree of shrub of the genus Cornus often having showy bracts resembling flowers

Other hypernyms of silky cornel include cornel, dogwood.

silky cornel (noun)	dogwood tree (noun)
shrub of eastern North America having purplish stems and blue fruit	a tree of shrub of the genus Cornus often having showy bracts resembling flowers