私立探偵[shiritsutantei] private detective
探偵[tantei] detective
探偵小説[tanteishousetsu] detective story
偵察[teisatsu] scout out
偵察衛星[teisatsueisei] reconnaissance satellite

偵察機[teisatsuki] reconnaissance plane
偵察隊[teisatsutai] scouting party
偵知[teichi] spying
内偵[naitei] secret investigation
密偵[mittei] spy

監察[kansatsu] inspection
監察医[kansatsui] medical coroner
観察[kansatsu] observation
観察的研究[kansatsutekikenkyuu] observational study
機動警察[kidoukeisatsu] mobile police

軍事警察[gunjikeisatsu] military police
警察[keisatsu] police
警察官[keisatsukan] policemen
警察署[keisatsusho] police station