Seismisms is a plural noun derived from the word "seismism" which means a sudden violent shaking of the ground, typically causing great destruction. The word is pronounced /ˈsaɪzəmɪzəmz/ with emphasis on the first syllable "sai". The first "s" is pronounced as a voiced "z" sound while the second "s" is pronounced as an unvoiced "s" sound. The suffix -isms is pronounced "izms". Although the spelling of seismisms may be confusing, it is important to spell it correctly to avoid misspelling or confusion.