首尾音

onset and rime

head / chief / first (occasion, thing etc) / classifier for poems, songs etc

sound / noise / note (of musical scale) / tone / news / syllable / reading (phonetic value of a character)

tail / remainder / remnant / extremity / sixth of the 28 constellations / classifier for fish

horse's tail / pointed posterior section of a locust etc

final sound of a syllable / rhyme (e.g. in European languages)

head and tail