European ash vs common European ash

European ash and common European ash both are nouns.

Word	Noun	Adjective	Verb	Adverb
European ash	Yes	No	No	No
common European ash	Yes	No	No	No

As nouns, European ash and common European ash are synonyms defined as:

European ash and common European ash: tall ash of Europe to the Caucasus having leaves shiny dark-green above and pale downy beneath

Other synonyms of European ash include Fraxinus excelsior.

European ash (noun)	common European ash (noun)
tall ash of Europe to the Caucasus having leaves shiny dark-green above and pale downy beneath	tall ash of Europe to the Caucasus having leaves shiny dark-green above and pale downy beneath