Corylus avellana vs Corylus avellana grandis

Corylus avellana and Corylus avellana grandis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Corylus avellana	Yes	No	No	No
Corylus avellana grandis	Yes	No	No	No

As nouns, Corylus avellana and Corylus avellana grandis are synonyms defined as:

Corylus avellana and Corylus avellana grandis: small nut-bearing tree much grown in Europe

Other synonyms of Corylus avellana include cobnut, filbert.

Corylus avellana (noun)	Corylus avellana grandis (noun)
small nut-bearing tree much grown in Europe	small nut-bearing tree much grown in Europe