#allomorph  a variant phonological representation of a morpheme: "the final sounds of `bets' and `beds' and `horses' and `oxen' are allomorphs of the English plural morpheme"
  supertype:  morpheme  minimal meaningful language unit; it cannot be divided into smaller meaningful units
  subtype:  morphophoneme  (linguistics) the phonemes (or strings of phonemes) that constitute the various allomorphs of a morpheme

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