Clethra alnifolia vs white alder

Clethra alnifolia and white alder both are nouns.

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

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

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

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

Clethra alnifolia (noun)	white alder (noun)
shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers	tree of western United States
	shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers