Rule 7 says that when two vowelled wāws occur at the beginning of a word, the first is obligatorily converted to hamzah.
وَوَاصِلُ → أَوَاصِلُ
Translation: The plural associated with wāṣil, with initial hamzah.
وَوَاعِدُ → أَوَاعِدُ
Translation: The plural associated with wāʿid, with initial hamzah.
The essential condition is the consecutive initial pair of vowelled wāws, not merely an isolated initial wāw.
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Rule 7: Two Consecutive Moving Wāws
Miscellaneous Morphological Explanations: Eight Rules for Wāw, Yāʾ, Alif and Hamzah
Rule 7 says that when two vowelled wāws occur at the beginning of a word, the first is obligatorily converted to hamzah.
وَوَاصِلُ → أَوَاصِلُ
Translation: The plural associated with wāṣil, with initial hamzah.
وَوَاعِدُ → أَوَاعِدُ
Translation: The plural associated with wāʿid, with initial hamzah.
The essential condition is the consecutive initial pair of vowelled wāws, not merely an isolated initial wāw.