cofactor /kō-fakˈtər/

1. A factor which occurs along with other factors in multiplication
2. A nonprotein organic molecule or a metallic ion that binds with an enzyme and is essential to the enzyme's activity (biology)

• night-hags
• nighthawk
• nighthawks
• night heron
• night herons
• night-house
• night-houses
• night-hunter
• night-hunters
• nightie
• nighties
• nightingale
• nightingales
• nightjar
• nightjars
• night latch
• night latches
• nightless
• night letter
• night letters
• nightlife
• nightlifes
• night-light
• night-lights
• night-line