Alnus rugosa vs speckled alder

Alnus rugosa and speckled alder both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alnus rugosa	Yes	No	No	No
speckled alder	Yes	No	No	No

As nouns, Alnus rugosa and speckled alder are synonyms defined as:

Alnus rugosa and speckled alder: common shrub of Canada and northeastern United States having shoots scattered with rust-colored down

Alnus rugosa (noun)	speckled alder (noun)
common shrub of Canada and northeastern United States having shoots scattered with rust-colored down	common shrub of Canada and northeastern United States having shoots scattered with rust-colored down