1. Vitally important
   - life-and-death

See also: crucial, important

• replaceability
• replaceable
• replacement
• replacement cost
• replacing
• replant
• replay
• replenish
• replenishment
• replete
• repleteness
• repletion
• replevin
• replevy
• replica
• replicable
• replicant
• replicate
• replication
• reply
• reply-paid
• repo
• repoint
• report
• report card