What are famous Arabic sayings?
What is the most famous Arab word?
مرحباً (Marhaban) ... 

إن شاء الله (In sha' Allah) ... 
يوم (Yawm) ... 
عائلة (Aa'ila) ... 
حب (Hubb) ... 
جميل (Jameel) ... 
حياة (Hayat) ... 
قهوة (Qahwa)