How do gharīb al-Qurʾān and gharāʾib al-Qurʾān differ?

Exceptional Qur’anic Passages, the Five Sciences, and Outward–Inward Understanding

• The first explains unfamiliar words; the second identifies exceptional features
• Both refer only to rules of recitation
• The first is abrogation and the second inheritance
• They invariably denote exactly the same subject