Alnus vulgaris vs European black alder

Alnus vulgaris and European black alder both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alnus vulgaris	Yes	No	No	No
European black alder	Yes	No	No	No

As nouns, Alnus vulgaris and European black alder are synonyms defined as:

Alnus vulgaris and European black alder: medium-sized tree with brown-black bark and woody fruiting catkins; leaves are hairy beneath

Other synonyms of Alnus vulgaris include Alnus glutinosa, common alder.

Alnus vulgaris (noun)	European black alder (noun)
medium-sized tree with brown-black bark and woody fruiting catkins; leaves are hairy beneath	medium-sized tree with brown-black bark and woody fruiting catkins; leaves are hairy beneath