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

See also: crucial, important

• screw propeller
• screw thread
• screw tree
• screw wrench
• screw-loose
• screw-pine family
• screw-topped
• screwball
• screwballer
• screwbean
• screwbean mesquite
• screwdriver
• screwer
• screwing
• screwtop
• screwup
• screwworm
• screwy
• Scriabin
• scribble
• scribbler
• scribbling block
• scribe
• scriber
• scribing block