PURIFY is a term used to describe the process of making something pure or CLEAN. ABSOLVE (7 letters) is to free from blame or guilt, DEPURATE (8 letters) is to purify by removing impurities, DECONTAMINATE (13 letters) is to remove contaminants, EXPURGATE (9 letters) is to remove objectionable material, RAREFY (6 letters) is to make less dense, DISINFECT (9 letters) is to free from germs, SIFT (4 letters) is to separate with a sieve, CLEAR (5 letters) is to make free from confusion or doubt, HEAL (4 letters) is to make healthy again, CLEAN (5 letters) is to make free from dirt, PURGE (5 letters) is to rid of impurities, REFNE (5 letters) is to make more precise, REFINE (6 letters) is to make more subtle or pure, and CLEANSE (7 letters) is to make free from dirt or impurities. All of these words are related to the term PURIFY in that they all describe processes of making something pure or CLEAN.