zástupc
Zástupc is not a standard Czech word; the normal form is zástupce. It is a noun meaning a substitute, deputy, or representative—someone who stands in for another person, typically with some authority to perform duties in the absence or incapacity of the principal.
In usage, zástupce appears in formal and administrative contexts. Common examples include zástupce ředitele (deputy director),
Etymology traces zástupce to the stem zástup- meaning substitution or stand-in, with the agentive suffix -ec
In legal and formal contexts, it is important to distinguish zástupce from zmocněnec or oprávněný zástupce.