lightning strike 
noun British
A strike by workers after little or no warning, especially without official union backing.
- comic song
- comic strip
- comic timing
- comic valentine
- comigrate
- coming
- coming and going (or comings and goings)
- coming of age
- Comino
- COMINT
- Comintern
- comiscible
- comital
- comitology
- comity
- comity of nations
- comix
- comm
- comma
- comma butterfly
- Commager, Henry Steele
- command
- command and control
- commandant
- command chain