excavation (n.)

• abysm
• abyss
• arroyo
• avulsion
• breach
• break
• burrow
• canyon
• catching
• cavity
• chap
• chasm
• check
• chimney
• chink
• cleft
• col
• crack
• cranny
• crater
• crevasse
• crevice
• cut
• cwm
• deepening
• defile
• dell
• depression
• deracination
• detection
• determination
• dig
• digging
• diggings
• dike
• disclosure
• discovery
• disentanglement
• ditch
• draw
• drawing
• drilling
• engraving
• enucleation
• eradication
• espial
• evolvement
• evulsion
• excision
• exhumation
• exposure
• expression
• extirpation
• extraction
• extrication
• fault
• find
• finding
• fissure
• flaw
• flume
• fracture
• furrow
• gap
• gape
• gash
• gorge
• groove
• gulch
• gulf
• gully
• hole
• hollow
• incision
• indentation
• invention
• joint
• leak
• locating
• location
• lowering
• mine
• mining
• moat
• notch
• nullah
• opening
• pass
• passage
• pit
• pulling
• quarry
• quarrying
• ravine
• recognition
• rediscovery
• removal
• rent
• revelation
• rift
• rime
• rupture
• scissure
• seam
• serendipity
• shaft
• sinking
• slit
• slot
• split
• spotting
• strike
• trench
• trough
• trove
• tunnel
• uncovering
• valley
• void
• wadi
• well
• withdrawal
• workings