وَكَذَّبُوا۟ بِـَٔايَـٰتِنَا كِذَّابًا ۝٢٨ What role does كِذَّابًا perform?

Surah An-Naba — Part 4

• Cognate accusative intensifying كَذَّبُوا۟
• Object of the preposition بِـ
• Subject of كَذَّبُوا۟
• Adjective of ءَايَـٰت