Rule 6 records two special cases where initial wāw with fatḥa has become hamzah. The book does not present unrestricted conversion of every fatḥa-bearing initial wāw.
وَحَدٌ → أَحَدٌ
Translation: One / unique; the established hamzah-initial form.
وَنَاةٌ → أَنَاةٌ
Translation: Deliberation or patience; the hamzah-initial form.
Contrast these specific transmitted examples with the permitted ḍamma/kasra environment in Rule 5.
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Rule 6: Two Specific Cases of Open-Vowel Wāw
Miscellaneous Morphological Explanations: Eight Rules for Wāw, Yāʾ, Alif and Hamzah
Rule 6 records two special cases where initial wāw with fatḥa has become hamzah. The book does not present unrestricted conversion of every fatḥa-bearing initial wāw.
وَحَدٌ → أَحَدٌ
Translation: One / unique; the established hamzah-initial form.
وَنَاةٌ → أَنَاةٌ
Translation: Deliberation or patience; the hamzah-initial form.
Contrast these specific transmitted examples with the permitted ḍamma/kasra environment in Rule 5.