ㄗˇ

  1. son
  2. child
  3. seed
  4. egg
  5. small thing
  6. 1st earthly branch: 11 p.m.–1 a.m., midnight, 11th solar month (7th December to 5th January), year of the rat
  7. viscount, fourth of five orders of nobility 五等爵位[wu3 deng3 jue2 wei4]
  8. ancient Chinese compass point: 0° (north)
  9. subsidiary subordinate (prefix) sub-

zi ˙ㄗ

  1. noun suffix, as in 椅子[yi3 zi5] "chair"

Where 子 is used

Sources