tử

tử
affix
  1. a child, especially a boy or son
  2. a learned person
  3. (physics, not productive) a particle

noun
  1. Clipping of tử số (“numerator”).

verb
  1. (in compounds or in certain expressions) to die

子

子
character
  1. chữ Hán form of tý (“first earthly branch”).
  2. Nôm form of tí (“a little bit; small”).
  3. chữ Hán form of tử (“child; son; small thing”).