sweet pepperbush vs Clethra alnifolia

sweet pepperbush and Clethra alnifolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet pepperbush	Yes	No	No	No
Clethra alnifolia	Yes	No	No	No

As nouns, sweet pepperbush and Clethra alnifolia are synonyms defined as:

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

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

sweet pepperbush (noun)	Clethra alnifolia (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