Constable and Narc

Constable noun - A member of a force charged with law enforcement at the local level.

Narc and constable are semantically related In some cases you can use "Narc" instead a noun "Constable".

Narc noun - A lawman concerned with narcotics violations.

Constable and narc are semantically related in person topic. You can use "Constable" instead a noun "Narc", if it concerns topics such as policeman, lawman, law enforcement officer.