How do plural endings sound different in words such as cats, dogs, and horses?

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In English, the pronunciation of plural suffixes is determined by phonological rules that depend on the final sound of the singular noun. These variations ensure the plural form is easily articulated.

  • Horses: When a word ends in a sibilant or strident sound (such as those in horse, maze, fish, rouge, church, or judge), the plural suffix adds an extra syllable, typically pronounced as [iz] or [əz]. This makes the plural form one syllable longer than the singular form.1
  • Cats: When a word ends in a voiceless sound (other than a sibilant), the suffix is pronounced as a voiceless [s].
  • Dogs: When a word ends in a voiced sound (other than a sibilant), the suffix is pronounced as a voiced [z].

These rules demonstrate how English speakers naturally group phonemes into natural classes to maintain consistent patterns in pronunciation.1