pepper bush vs summer sweet

pepper bush and summer sweet both are nouns.

Word	Noun	Adjective	Verb	Adverb
pepper bush	Yes	No	No	No
summer sweet	Yes	No	No	No

As nouns, pepper bush and summer sweet are synonyms defined as:

pepper bush and summer sweet: shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers

Other synonyms of pepper bush include Clethra alnifolia, sweet pepperbush, white alder.

pepper bush (noun)	summer sweet (noun)
shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers	shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers