| No. | Item | Definition |
|---|---|---|
| 1. | agent | person assigned to investigate |
| 2. | analyst | person who examines evidence |
| 3. | appraiser | person who judges evidence |
| 4. | assessor | person who evaluates findings |
| 5. | auditor | person who examines records |
| 6. | background checker | person investigating personal history |
| 7. | bloodhound | persistent clue follower |
| 8. | border agent | officer investigating border activity |
| 9. | case examiner | person reviewing a case |
| 10. | checker | person who verifies details |
| 11. | claims examiner | person investigating claims |
| 12. | codebreaker | person solving coded messages |
| 13. | coroner | official investigating deaths |
| 14. | counterspy | person investigating spies |
| 15. | crime analyst | specialist studying crime data |
| 16. | crime solver | person who solves crimes |
| 17. | debriefer | person extracting information afterward |
| 18. | decoder | person interpreting hidden information |
| 19. | detective | person who investigates crimes |
| 20. | diagnostician | expert identifying causes |
| 21. | disciplinary officer | official investigating violations |
| 22. | discoverer | person who uncovers facts |
| 23. | document examiner | expert inspecting documents |
| 24. | ethics officer | official examining misconduct |
| 25. | evaluator | person who assesses information |
| 26. | evidence analyst | person analyzing evidence |
| 27. | evidence reviewer | person reviewing evidence |
| 28. | examiner | person who inspects closely |
| 29. | examining magistrate | judge leading an investigation |
| 30. | explorer | person seeking new facts |
| 31. | fact checker | person verifying facts |
| 32. | fact-finder | person who uncovers facts |
| 33. | federal agent | national law officer |
| 34. | field agent | agent working on location |
| 35. | field examiner | person examining matters onsite |
| 36. | forensic analyst | specialist examining physical evidence |
| 37. | forensic examiner | specialist analyzing evidence |
| 38. | fraud examiner | person investigating fraud |
| 39. | gumshoe | informal detective |
| 40. | homicide detective | detective investigating killings |
| 41. | hound | persistent pursuer of facts |
| 42. | hunter | person searching persistently |
| 43. | inquest officer | official handling an inquest |
| 44. | inquirer | person who seeks information |
| 45. | inspecting officer | officer conducting an inspection |
| 46. | inspector | official who examines carefully |
| 47. | intelligence officer | official gathering intelligence |
| 48. | internal auditor | person investigating internal records |
| 49. | interrogator | person who questions intensely |
| 50. | interviewer | person who questions others |
| 51. | lead examiner | chief reviewing official |
| 52. | lookout | person watching for developments |
| 53. | loss adjuster | person investigating insurance losses |
| 54. | magistrate | judicial officer conducting inquiries |
| 55. | manhunter | person hunting suspects |
| 56. | medical examiner | official investigating deaths medically |
| 57. | monitor | person who observes developments |
| 58. | narcotics agent | agent investigating drug crimes |
| 59. | observer | person who watches carefully |
| 60. | officer | law or investigative official |
| 61. | ombudsman | official investigating complaints |
| 62. | ombudsperson | official investigating complaints |
| 63. | operative | person working on inquiries |
| 64. | pathologist | doctor investigating disease or death |
| 65. | PI | private investigator |
| 66. | plainclothesman | officer in civilian clothes |
| 67. | private detective | nonpolice detective |
| 68. | private eye | informal private detective |
| 69. | prober | person who investigates deeply |
| 70. | profiler | person analyzing offender traits |
| 71. | pursuer | person following a lead |
| 72. | questioner | person who asks questions |
| 73. | rapporteur | person appointed to investigate |
| 74. | records examiner | person reviewing records |
| 75. | researcher | person who studies systematically |
| 76. | review officer | official examining a matter |
| 77. | review specialist | specialist who examines matters |
| 78. | reviewer | person who examines something |
| 79. | scrutinizer | person who studies closely |
| 80. | searcher | person who looks thoroughly |
| 81. | shadow | person following secretly |
| 82. | sleuth | person who investigates skillfully |
| 83. | special agent | federal investigative agent |
| 84. | spotter | person noticing important details |
| 85. | spy | person gathering secrets |
| 86. | surveillant | person conducting surveillance |
| 87. | tail | person secretly following someone |
| 88. | tracer | person tracking movements |
| 89. | tracker | person who follows clues |
| 90. | troubleshooter | person finding causes of problems |
| 91. | truth finder | person uncovering the truth |
| 92. | truth-seeker | person seeking the truth |
| 93. | uncoverer | person revealing hidden facts |
| 94. | validator | person confirming legitimacy |
| 95. | verifier | person confirming accuracy |
| 96. | vetter | person checking suitability |
| 97. | vice officer | officer investigating vice crimes |
| 98. | watchdog | person guarding against wrongdoing |
| 99. | watcher | person who keeps watch |
| 100. | witness interviewer | person questioning witnesses |