Allah means God right? what silabiys has Allah is it like Al-lah?
so like the god? and is it possible to say for example Arrahmanu Akbar like Allahu Akbar?
Allah is His majesty name, but He also has 99 names
so it is OK to say Allahu akbar, or arrahmanu akbar.. or any else of His name
but in prayer you have to say Allahu akbar, because we are ordered to say it like this
but in doua'a or any thing else, you are free to mention any of His names, because all of them are belong to Him, and this is what the holy Quran says