inquiry (n.)

• assize
• audit
• canvass
• catechism
• check
• court-martial
• cross-examination
• cross-question
• demand
• detection
• enquiry
• examination
• exploration
• feeler
• hearing
• inquest
• inquisition
• inspection
• interrogation
• interrogative
• interrogatory
• investigation
• issue
• leader
• mistrial
• poll
• probe
• problem
• query
• quest
• question
• questioning
• questionnaire
• quodlibet
• research
• scrutiny
• search
• sifting
• sleuthing
• study
• survey
• topic
• trial
• witch-hunt