Identifying an idghām-with-ghunnah letter is not enough. Check whether the nūn and its follower are within one word or across word boundaries. Four familiar words retain clear nūn articulation:
دُنْيَا
بُنْيَان
قِنْوَان
صِنْوَان
In دُنْيَا, yāʾ follows nūn, yet the nūn is not merged into yāʾ. Correct application depends on the word boundary, not just the next letter.
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An important single-word exception
Comprehensive Revision — Applying Tajwīd Rules
Identifying an idghām-with-ghunnah letter is not enough. Check whether the nūn and its follower are within one word or across word boundaries. Four familiar words retain clear nūn articulation:
دُنْيَا
بُنْيَان
قِنْوَان
صِنْوَان
In دُنْيَا, yāʾ follows nūn, yet the nūn is not merged into yāʾ. Correct application depends on the word boundary, not just the next letter.