The word "cides" is pronounced as /saɪdz/ and refers to a suffix indicating "killing." The spelling of this word follows the English phonetic system where "c" is pronounced as /s/ and "i" as /aɪ/. The suffix "-cides" is derived from the Greek word "kidein," which means "to kill." Some common words that use the suffix "-cides" include "homicide," "insecticide," and "suicide." Understanding the correct spelling of this suffix is crucial in effective communication of ideas related to killing or extermination.