Clethra alnifolia vs pepper bush

Clethra alnifolia and pepper bush both are nouns.

Word	Noun	Adjective	Verb	Adverb
Clethra alnifolia	Yes	No	No	No
pepper bush	Yes	No	No	No

As nouns, Clethra alnifolia and pepper bush are synonyms defined as:

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

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

Clethra alnifolia (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