Already, on the other hand, carries some different meanings:
1. By this time; soon: “Are you finished with your work already?”
2. Before this time: “We arrived at noon but you had already gone.”
Usage example that uses these 2 words: I was all ready to go on my trip, but when I went to the bus station, I found out that the bus had already gone and so I had to wait two hours for the next one.