crucible (n.)

• affliction
• agitator
• alembic
• anvil
• aspirator
• assay
• beaker
• beater
• blender
• blowpipe
• burette
• caldron
• calvary
• churn
• condenser
• criterion
• cross
• determination
• distiller
• eggbeater
• emulsifier
• engine
• essay
• etna
• lathe
• machine
• mixer
• mortar
• motor
• ordeal
• pipette
• probation
• proof
• receiver
• retort
• standard
• still
• test
• touchstone
• transducer
• transformer
• trial
• tribulation
• try
• verification
• visitation