KEY: Improvement.
SYN: Advancement, amendment, progress, increase, correction,proficiency.
ANT: Degeneracy, degeneration, deterioration, debasement,retrogradation, retrogression.

• Arrant
• Array
• Array \v
• Arrest \r
• Arrival, [See ARRIVE]
• Arrive
• Arrogance
• Arrogate
• Art
• Artful
• Articular
• Artifice
• Artificial
• Artless, [See ARTFUL]
• Ascend
• Ascendancy
• Ascertain
• Ascribe
• Askant
• Aspect
• Asperity
• Asperse
• Aspiration
• Assail, [See ASSAULT]
• Assault