Synonyms for A-one:

• n.

  •
  • boss,
  • superb,
  • fine,
  • first class,
  • excellent,
  • bully,
  • champion,
  • quality,
  • good,
  • swell,
  • capital,
  • terrific,
  • top,
  • brag,
  • great,
  • banner,
  • dandy,
  • splendid,
  • prime.
  •a-one (noun)
  • superior.

• Other synonyms:

  •
  • tophole,
  • topflight,
  • blue-ribbon.

Antonyms for A-one:

• adj.

  • Other antonyms:
    inferior.