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Sound change and alternation
Metathesis Quantitative metathesis
Lenition Consonant gradation Consonant voicing and devoicing Assibilation Spirantization L-vocalization Debuccalization
Fortition
Epenthesis Prothesis Paragoge Unpacking Vowel breaking
Elision Apheresis Syncope Apocope Haplology Cluster reduction
Transphonologization Compensatory lengthening Nasalization Tonogenesis Floating tone
Assimilation Fusion Coarticulation Palatalization Velarization Labialization Final devoicing Metaphony (vowel harmony, umlaut) Consonant harmony
Dissimilation
Sandhi Liaison, linking R Consonant mutation Tone sandhi Vowel hiatus Synalepha Elision Crasis Synaeresis and diaeresis Synizesis
Other types Apophony Affrication Gemination Clipping Fronting Raising Betacism Iotacism Fusion Merger Compensatory lengthening Monophthongization Rhotacism Rhinoglottophilia Sulcalization Shm-reduplication Consonant mutation Vowel shift Chain shift
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In historical linguistics, vowel breaking, vowel fracture,^[1] or diphthongization is the sound change of a monophthong into a diphthong or triphthong.

^ The American Heritage Dictionary of the English Language, Fourth Edition 2000 by Houghton Mifflin Company.