How do we distinguish muslimiyya from qāḍiyya?

Iḍāfah to Yāʾ al-Mutakallim and the Six Nouns

• Muslimiyya derives from a sound masculine plural; qāḍiyya has lexical final yāʾ
• Both are verbs
• Both are maqṣūr nouns
• Muslimiyya has no pronoun