apophony

/əˈpɑfəni/
noun
  1. A change in the vowel sound of a word that indicates a grammatical change, such as tense or number (e.g., 'sing' to 'sang').
    • The teacher explained how apophony works in English irregular verbs.
    • Many languages use apophony to show differences in meaning.
    • Apophony is common in strong verbs like 'ring, rang, rung.'
Synonyms
What does "apophony" mean? | whatsthatwordmean | whatsthatwordmean