KEY: Percussion.
SYN: Collision, shock, encounter, crash.
ANT: Graze, touch, recoil, rebound, repercussion, reverberation.

• Astonished
• Astonishing
• Astonishment
• Astray
• Astute
• Asunder
• Athletic
• Atom
• Atonement
• Atrocious
• Attach
• Attachment, [See ATTACH]
• Attack
• Attack, [See {[(]?}]
• Attain
• Attainment
• Attemper
• Attempt
• Attempt
• Attend
• Attention
• Attentive, [See OBSERVANT]
• Attenuate
• Attest
• Attestation, [See EVIDENCE]