Linked from
The 45 pages that link to Sound change, each with the reason it gives.
CognateRelated: Regular sound changes explain why cognate words may no longer sound alike.
EtymologyRelated: Regular sound changes explain why related words can look and sound different.
Vowel harmonyRelated: Historical sound changes can create, reshape, or remove harmony patterns.
Old FrenchRelated: Regular sound changes separated Old French from its Latin ancestry.
Inuit languagesRelated: Regional sound changes help distinguish neighboring Inuit varieties.