summer sweet vs pepper bush

summer sweet and pepper bush both are nouns.

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

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

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

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

summer sweet (noun)	pepper bush (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