How to sign: a scientist who devotes himself to doing research
Similiar / Same: research worker, researcher
Categories: man of science, scientist
Within this category: boffin, experimenter, fieldworker, postdoc
How to sign: a police officer who investigates crimes
Similiar / Same: detective, tec, police detective
Categories: officer, policeman, police officer
Within this category: dick, plainclothesman, tracer