dogwood vs flowering tree

dogwood and flowering tree both are nouns.

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

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

dogwood: a tree of shrub of the genus Cornus often having showy bracts resembling flowers
flowering tree: any tree having seeds and ovules contained in the ovary

Other hypernyms of dogwood include angiospermous tree.

dogwood (noun)	flowering tree (noun)
a tree of shrub of the genus Cornus often having showy bracts resembling flowers	any tree having seeds and ovules contained in the ovary
hard tough wood of any dogwood of the genus Cornus; resembles boxwood