Synonyms for Bougainville trench:

• Other synonyms:

  •n.
  • deep,
  • oceanic abyss,
  • trench.
  •Other relevant words:
  • abstruse,
  • bass,
  • cryptic,
  • cryptical,
  • deeply,
  • ditch,
  • encroach,
  • entrench,
  • impinge,
  • inscrutable,
  • late,
  • mysterious,
  • mystifying,
  • recondite,
  • rich,
  • thick.