exploration (n.)

• adventure
• analysis
• dragnet
• enquiry
• examination
• expedition
• forage
• frisk
• hunt
• hunting
• inquiry
• inspection
• investigation
• mission
• observation
• pilgrimage
• posse
• probe
• quest
• ransacking
• recce
• recco
• reconnaissance
• reconnoitering
• research
• review
• rummage
• scouting
• scrutiny
• search
• searching
• stalk
• stalking
• study
• survey