General synonyms:
* Commander: This is a more general term, applicable to various ranks, but can be used for a colonel in some contexts.
* Officer: This is a broad term encompassing all ranks above enlisted personnel, but not specific to any particular rank.
Military synonyms:
* Lieutenant colonel: This is the rank below colonel, but can sometimes be used as a synonym in informal situations.
* Commanding officer (CO): This term is used for the officer in charge of a unit, which could be a colonel.
* Regimental commander: This refers specifically to the commander of a regiment, which is often a colonel.
Other options:
* Leader: This is a more general term that can be used in various contexts, but might be too broad depending on the specific situation.
* Chief: This can be used for a colonel in some situations, but might be considered informal.
Ultimately, the best synonym for "colonel" depends on the specific context and what you want to emphasize.