参謀

1. Origins, structure, and basic meaning

• Structure: 参謀 (さんぼう) is a noun for a strategic military adviser or, figuratively, a key behind-the-scenes aide.
• Basic usage: 参謀を集める makes military advisers the people summoned for strategy, while 参謀として信頼される marks the figurative role of a person supporting a representative.

2. Common pitfalls and similar expressions

• Military post and figurative aide
  • 将軍の参謀 is a military role, whereas 代表を支える参謀 figuratively supports a leader with strategy. The latter does not imply holding military rank.