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

其の内[sonouchi] before very long
河内[hanoi] Hanoi
案内[annai] information
案内係[annaigakari] clerk at the information desk
案内所[annaijo] information desk

案内書[annaisho] guidebook
案内嬢[annaijou] usherette
以内[inai] within
域内[ikinai] inside the area
一時間以内[ichijikaninai] within one hour