common European ash vs European ash

common European ash and European ash both are nouns.

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

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

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

Other synonyms of common European ash include Fraxinus excelsior.

common European ash (noun)	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