No. 3,207 in Russian
начальником
"Начальником" means "boss" or "superior."
In a sentence
Он был назначен начальником отдела.
He was appointed as the head of the department.
In this sentence, 'начальником' is used in the instrumental case to describe the role or capacity to which someone has been appointed.
Я работаю под руководством нового начальника.
I work under the guidance of the new chief.
Here, 'начальником' is implied as 'начальника', indicating the genitive case to describe possession or roles indirectly.
Эта проблема обсуждалась с начальником производственного отдела.
This issue was discussed with the head of the production department.
In this usage, 'начальником' implies an instrumental case to denote whom the action of discussing is performed with.
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