
1) Ablaut
Found on
https://www.crosswordclues.com/clue/apophony

In linguistics, apophony (also known as ablaut, gradation, mutation, alternation, internal modification, stem modification, stem alternation, replacive morphology, stem mutation, internal inflection etc.) is the alternation of sounds within a word that indicates grammatical information (often inflectional). Apophony is exemplified in English as th...
Found on
http://en.wikipedia.org/wiki/Apophony

apophony Variation in vowel quality in the formation of grammatically related words, as in English: give, gave.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2737/2
No exact match found.