A Detective is a member of the police force or a private investigator whose function is to obtain information and evidence.

Depending on what type of detective, you could have officer, private eye, investigator, old 40's term used in movies "dick"

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A few other names for detective are: Police Detective,

Gum Shoe, P. I.(Private Investigator), Psychic Detective,

Agent, Reporter, Scout, Sleuth, Snoop, Spy and Analyst.

PI - Private Detective

DI - Detective Inspector (Police)

DS - Detective Sargent (Police)

DC - Detective Constable (Police)

TDC - Training Detective Constable (Police)

A detective or a private investigator.

there is a crime seen investigator, there is a cop, their is n officer