دَابَّةٌ → دَوَابُّ
دَوَابُّ is the plural of دَابَّةٌ. Its form belongs to صيغة منتهى الجموع, so it is ghayr munsarif and does not take tanwin.
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First Established Pair
Cause of Ghayr Munsarif: Sighat Muntaha al-Jumu'
دَابَّةٌ → دَوَابُّ
دَوَابُّ is the plural of دَابَّةٌ. Its form belongs to صيغة منتهى الجموع, so it is ghayr munsarif and does not take tanwin.