Traditional:

shǔ ㄕㄨˇ

  1. category
  2. genus (taxonomy)
  3. family members
  4. dependents
  5. to belong to
  6. subordinate to
  7. affiliated with
  8. be born in the year of (one of the 12 animals)
  9. to be
  10. to prove to be
  11. to constitute

zhǔ ㄓㄨˇ

  1. to join together
  2. to fix one's attention on
  3. to concentrate on

Sources