- nutcracker, nutcrackers - a compound lever used to crack nuts open
--1 is a kind of compound lever
- nuthatch, nutcracker - any of various small short-tailed sharp-beaked birds that creep on trees and feed on small nuts and insects
--2 is a kind of oscine, oscine bird
--2 is a member of Sittidae, family Sittidae
--2 has particulars:European nuthatch, Sitta europaea; red-breasted nuthatch, Sitta canadensis; white-breasted nuthatch, Sitta carolinensis - nutcracker - speckled birds that feed on nuts
--3 is a kind of corvine bird
--3 is a member of Nucifraga, genus Nucifraga
--3 has particulars:common nutcracker, Nucifraga caryocatactes; Clark's nutcracker, Nucifraga columbiana