- cobnut, filbert, Corylus avellana, Corylus avellana grandis - small nut-bearing tree much grown in Europe
--1 is a kind of hazelnut, hazel, hazelnut tree
- hazelnut, filbert, cobnut, cob - nut of any of several trees of the genus Corylus
--2 is a kind of edible nut
--2 is a part of hazelnut, hazel, hazelnut tree