Celtis australis vs European hackberry

Celtis australis and European hackberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
Celtis australis	Yes	No	No	No
European hackberry	Yes	No	No	No

As nouns, Celtis australis and European hackberry are synonyms defined as:

Celtis australis and European hackberry: bright green deciduous shade tree of southern Europe

Other synonyms of Celtis australis include Mediterranean hackberry.

Celtis australis (noun)	European hackberry (noun)
bright green deciduous shade tree of southern Europe	bright green deciduous shade tree of southern Europe