盟主

méngzhǔ

leader of an alliance

Wiktionary

Entry Composition

=1 盟 méng
  1. oath
  2. pledge
  3. union
  4. to ally
  5. league, a subdivision corresponding to prefecture in Inner Mongolia
=1 盟 mèng only used in 盟津, alternative form of 孟津 (Mèngjīn)
=2 主 zhǔ
  1. owner
  2. master
  3. host
  4. individual or party concerned
  5. God
  6. Lord
  7. main
  8. to indicate or signify
  9. trump card (in card games)
=2 主 zhù
  1. Classifier for events.
  2. alternative form of 注 (zhù, “to pour into”)