Your have several options to express the comparative and superlative in Egyptian Arabic. An overview.
The Islamic call to prayer is a tricky construction. In Sunni Islam, the muezzin uses khayr (خير) which strangely denotes a comparative (better). Why?
The word الدُّنْيا (al-Dunya) means the world. But that is only the interpretation of the word - but not the literal meaning!