KEY: Axiom.
SYN: {Self-evident_truth}, aphorism, truism, apophthegm, maxim.
ANT: Nonsense, absurdity, soliloquy, absurdness.

• Activity
• Act_
• Actor
• Actual
• Actually
• Actuate
• Acuity
• Aculeated
• acumen
• Acute
• Acutely
• Adage
• Adapt
• Adaptation
• Add
• Addendum
• Addicted
• additament
• addition
• Addition
• Address
• Address \v
• Adduce
• Adept
• Adequate