filbert vs Corylus avellana

filbert and Corylus avellana both are nouns.

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

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

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

Other synonyms of filbert include cobnut, Corylus avellana grandis.

filbert (noun)	Corylus avellana (noun)
nut of any of several trees of the genus Corylus	small nut-bearing tree much grown in Europe
small nut-bearing tree much grown in Europe