green alder vs Alnus crispa

green alder and Alnus crispa both are nouns.

Word	Noun	Adjective	Verb	Adverb
green alder	Yes	No	No	No
Alnus crispa	Yes	No	No	No

As nouns, green alder and Alnus crispa are synonyms defined as:

green alder and Alnus crispa: North American shrub with light green leaves and winged nuts

Other synonyms of green alder include Alnus veridis crispa.

green alder (noun)	Alnus crispa (noun)
shrub of mountainous areas of Europe	North American shrub with light green leaves and winged nuts
North American shrub with light green leaves and winged nuts