European black alder vs common alder

European black alder and common alder both are nouns.

Word	Noun	Adjective	Verb	Adverb
European black alder	Yes	No	No	No
common alder	Yes	No	No	No

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

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

Other synonyms of European black alder include Alnus glutinosa, Alnus vulgaris.

European black alder (noun)	common 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