no-nos

/N OW1 N OW0 Z/
noun
  1. 1

    Something that is forbidden, prohibited, discouraged or taboo.

    โ€œSmoking indoors is becoming a real no-no these days, in many places.โ€

  2. 2

    A no-hitter; a game in which no batter on one of the teams got a hit.

    โ€œHe threw two no-nos in his career.โ€

Antonyms

Source: https://en.wiktionary.org/wiki/no-no, https://en.wiktionary.org/wiki/no-nos