قَامَ عُمَرُ وَعُمَرٌ آخَرُ
قَامَ: past verb. First عُمَرُ: nominative subject, diptote; no tanwīn. وَ: conjunction.
Second عُمَرٌ: nominative coordinated noun with tanwīn. آخَرُ: nominative diptote adjective. Both nouns are nominative; the change is in their declensional treatment.
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Restoring Declension: Indefinite Names, Al- and Iḍāfah
قَامَ عُمَرُ وَعُمَرٌ آخَرُ
قَامَ: past verb. First عُمَرُ: nominative subject, diptote; no tanwīn. وَ: conjunction.
Second عُمَرٌ: nominative coordinated noun with tanwīn. آخَرُ: nominative diptote adjective. Both nouns are nominative; the change is in their declensional treatment.