white alder vs summer sweet

white alder and summer sweet both are nouns.

Word	Noun	Adjective	Verb	Adverb
white alder	Yes	No	No	No
summer sweet	Yes	No	No	No

As nouns, white alder and summer sweet are synonyms defined as:

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

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

white alder (noun)	summer sweet (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