purifier (n.)

• cathartic
• cleaner
• cleanser
• colander
• cradle
• cream
• cribble
• dentifrice
• detergent
• diuretic
• emetic
• enema
• filter
• holystone
• lotion
• mouthwash
• nauseant
• percolator
• purgative
• purge
• refiner
• refinery
• riddle
• rinse
• rocker
• screen
• shampoo
• sieve
• sifter
• soap
• solvent
• strainer
• toothpaste
• wash
• winnow