dogwood tree vs dogwood

dogwood tree and dogwood both are nouns.

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

As nouns, dogwood tree and dogwood are synonyms defined as:

dogwood tree and dogwood: a tree of shrub of the genus Cornus often having showy bracts resembling flowers

Other synonyms of dogwood tree include cornel.

dogwood tree (noun)	dogwood (noun)
a tree of shrub of the genus Cornus often having showy bracts resembling 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