lock·nut also lock nut 
(lŏknŭt′)
(lŏknŭt′)n.
1. A usually thin nut screwed down on another nut to prevent it from loosening.
2. A self-locking nut.
- King's Bench
- King's Counsel
- King's English
- kingship
- kingside
- king-size
- king-sized
- Kingsley
- Kingsley William
- King's Lynn
- king snake
- kingsnake
- kings-of-arms
- Kings Peak
- Kingsport
- Kings River
- Kingston
- Kingston
- Kingston-upon-Hull
- Kingston-upon-Hull
- Kingstown
- king truss
- king vulture
- King Wallis
- King William Island