white alder vs Clethra alnifolia

white alder and Clethra alnifolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
white alder	Yes	No	No	No
Clethra alnifolia	Yes	No	No	No

As nouns, white alder and Clethra alnifolia are synonyms defined as:

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

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

white alder (noun)	Clethra alnifolia (noun)
tree of western United States	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