The term 'free from contamination' can be summarized by two crossword solutions: 'CLEAN' and 'PURE'. CLEAN is a 5-letter word that means to make something free of dirt, germs, or other impurities. PURE is a 4-letter word that means free from anything of a different, inferior, or contaminating kind; free from extraneous matter. Together, these two words describe something that is free from any contamination or impurities.