fire / hellfire
Feminine noun (no tāʾ marbūṭa but grammatically feminine). Interestingly shares the root ن-و-ر with نُورٌ (light). Appears over 140 times in the Quran.
Descriptions of the Fire serve as warnings in the Quran. Islamic scholars emphasize that God's mercy precedes His wrath, and hope should accompany fear.