phon-, phono-
(Greek: (classic and modern) phono, phonos; slaughter, kill, murder, homicide)
Don't confuse this phono-, phon- with another phono-, phon-, etc. that means "sound, voice, speech". In Greek, a distinction is made between the phonos (PHOH nohs), "murder", which is spelled with the letter omicron in the last syllable; and the Greek phonos (phoh NOHS), "voice", which is spelled with the letter omega in the last syllable. Both omicron and omega became the letter "o" in English.