Which distinction is overtly present between al-ʿusr and yusran?

Supplementary Practice 18: Rhetorical Analysis of Sūrat al-Ḍuḥā and Sūrat al-Sharḥ

• Both are indefinite
• Al-ʿusr is definite, while yusran is indefinite
• Both are past-tense verbs
• Yusran bears the definite article