fall-blooming hydrangea vs Hydrangea paniculata

fall-blooming hydrangea and Hydrangea paniculata both are nouns.

Word	Noun	Adjective	Verb	Adverb
fall-blooming hydrangea	Yes	No	No	No
Hydrangea paniculata	Yes	No	No	No

As nouns, fall-blooming hydrangea and Hydrangea paniculata are synonyms defined as:

fall-blooming hydrangea and Hydrangea paniculata: deciduous shrub or small tree with pyramidal flower clusters

fall-blooming hydrangea (noun)	Hydrangea paniculata (noun)
deciduous shrub or small tree with pyramidal flower clusters	deciduous shrub or small tree with pyramidal flower clusters