summer sweet vs sweet pepperbush

summer sweet and sweet pepperbush both are nouns.

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

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

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

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

summer sweet (noun)	sweet pepperbush (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