rock·shaft 
(rŏkshăft′)
(rŏkshăft′)n.
A shaft that oscillates or rocks upon its bearings but does not revolve.
- nationality
- nationalization
- nationalize
- nationalizer
- nationally
- national monument
- national park
- national seashore
- National Socialism
- nationhood
- nationless
- Nation of Islam
- nation-state
- nationwide
- native
- Native Alaskan
- Native American
- native-born
- Native Hawaiian
- natively
- nativeness
- nativism
- nativist
- nativistic
- nativity