قِنْوَان and صِنْوَان have nūn sākinah before wāw within one word. The source explicitly assigns them iẓhār.
Compare the two-word مِنْ وَالٍ, where idghām with ghunnah applies, with the single-word قِنْوَان, where the n remains distinct.
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One-word exception: qinwān and ṣinwān
Sākin Nūn & Tanwīn — Iẓhār, Idghām, Qalb and Ikhfāʾ
قِنْوَان and صِنْوَان have nūn sākinah before wāw within one word. The source explicitly assigns them iẓhār.
Compare the two-word مِنْ وَالٍ, where idghām with ghunnah applies, with the single-word قِنْوَان, where the n remains distinct.