In النَّاسِ, the definite-article lām assimilates into nūn, and the doubled nūn requires ghunnah.
In الْوَسْوَاسِ, wāw is a moon letter so the lām remains audible. In الْخَنَّاسِ, khāʾ is likewise a moon letter, but the doubled nūn later in the word still requires ghunnah.
Differentiate assimilation of the article lām from ghunnah on an internal doubled nūn.
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Al-Nās: sun-letter assimilation and ghunnah
Applied Tajwīd Diagnostics: Four Short Sūrahs
In النَّاسِ, the definite-article lām assimilates into nūn, and the doubled nūn requires ghunnah.
In الْوَسْوَاسِ, wāw is a moon letter so the lām remains audible. In الْخَنَّاسِ, khāʾ is likewise a moon letter, but the doubled nūn later in the word still requires ghunnah.
Differentiate assimilation of the article lām from ghunnah on an internal doubled nūn.