1. Vigilant
   - on guard, upon one's guard, on your guard

See also: wary

• nearly
• nearness
• nearside
• nearsighted
• nearsightedness
• neat
• neat's-foot oil
• neaten
• neath
• neatherd
• neatly
• neatness
• neb
• nebbech
• nebbish
• Nebcin
• NEbE
• Nebiim
• NEbN
• Nebo
• Nebraska
• Nebraska fern
• Nebraskan
• nebuchadnezzar
• Nebuchadnezzar II