KEY: Capability.
SYN: Cleverness, aptitude, talent, capacity, power, facility,faculty.
ANT: Dulness, inaptitude, awkwardness, difficulty.

• Stout
• Straight
• Strain
• Strait \a
• Strait
• Strange
• Stranger
• Stratagem
• Stray
• Stream
• Strengthen
• Strenuous
• Stress
• Stretch
• Strict
• Stricture
• Strife
• Strike
• Striking
• Strip
• Strive
• Stroll \r
• Strong
• Structure
• Struggle