noun / adjective
chief
CHEEF/tʃˈif/
Highest in rank or authority.
The fire chief speaks to the crew before the drill.

Etymology
Latin caput meant both the bodily 'head' and a leader. Chief preserves this image of the highest-ranking person as the head of a group.
In context
Trump had put her in charge of the C.I.A., NSA, and 16 other agencies. As intelligence chief, she was challenging the case for war in public.
More examples
- Our chief concern is getting everyone home safely.
- He served as chief engineer during construction.
- The chief approved the new training schedule.
Forms
chief · chiefs