I wonder about Words like "Allah., Quran., Muhammad.,Islam"
Question about these four words is., were they present before Islam and before the birth of alleged Prophet of Islam Muhammad(PBUH)?
Well, Allah is literally One God, so the words were already there, as was the name Muhammad, which means praiseworthy. Quran means recitation, and Islam means submission, also common words, even among a polytheist society.
As an aside, looking at names in the Jewish Talmud, like Iyyov / Job / Ayoub, which mean hated / persecuted, and Noah, which means rest / comfort, it seems like most of the names used in the Abrahamic faiths point towards the stories being parables rather than facts. In the case of Iyyov, which parent in their right mind names their kid hated and persecuted? Even Abraham is a possible parable with a name meaning father of many. This leads me to suspect that even Muhammad could have been a created character rather than a single real person)