دُخَانٌ / Dukhan: is the word used in Arabic for smoke, vapor, and gaseous matter. It is the sixth word of verse 41:11 and is an indefinite masculine noun and is in the nominative case (مرفوع). The noun’s root is (د خ ن). This root occurs twice in the Quran as the noun dukhān (دُخَان).
N – nominative masculine indefinite noun اسم مرفوع
(د خ ن): Dakhan, دخن, دخنا, یدخن: To smoke, raise smoke or dust, become altered, be ill-natured, fumigate, grope clumsily, handle (a thing) clumsily, spoil, fail to handle properly. Dukhân دُخَان : Smoke; Gas; Vaporous matter with suspended particles; Fume resembling smoke; Something fleeting or be clouding; Colored smoke; Suppressed state; Dust; Famine in which people feel a sort smoke hanging before their eyes or because of no rain for a long time the atmosphere becomes dusty; Drought.