sweet pepperbush vs summer sweet

sweet pepperbush and summer sweet both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet pepperbush	Yes	No	No	No
summer sweet	Yes	No	No	No

As nouns, sweet pepperbush and summer sweet are synonyms defined as:

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

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

sweet pepperbush (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