A researcher is someone who conducts research, i.e., an organized and systematic investigation into something. Scientists are often described as researchers.

Writers of novels that involve a lot of gathering of information––such as Michael Crichton, who writes about biology––hire researchers to help them gather and synthesize material. Other writers turn into researchers themselves, calling up doctor friends to discover interesting ways their characters can die.

Definitions of researcher
  1. noun
    a scientist who devotes himself or herself to doing research
    synonyms: investigator, research worker
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    a research worker who conducts experiments
    (British slang) a scientist or technician engaged in military research
    a researcher who works in the field
    post doc, postdoc
    a scholar or researcher who is involved in academic study beyond the level of a doctoral degree
    type of:
    a person with advanced knowledge of one or more sciences
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