The term COUGH QUELLER is composed of two crossword solutions, CODEINE (7 letters) and LOZENGE (7 letters). CODEINE is an opioid medication used to treat mild to moderate pain and also to suppress coughing. It is available in tablet, syrup, and solution forms. LOZENGE is a small, medicated candy that is used to treat sore throats and coughs. It is usually made with menthol or eucalyptus and is available in many flavors. Together, CODEINE and LOZENGE can be used to effectively reduce coughing.