1. Vitally important
   "a life-and-death struggle"
   - life-or-death

See also: crucial, important

• Cobitidae
• cobnut
• COBOL
• cobra
• cobweb
• cobwebbed
• cobwebby
• coca
• Coca Cola
• coca plant
• cocain
• cocaine
• cocaine addict
• cocaine addiction
• cocainise
• cocainize
• cocarboxylase
• coccal
• cocci
• coccid insect
• Coccidae
• Coccidia
• coccidioidomycosis
• coccidiomycosis
• coccidiosis