Already and Once

Already adverb - So as to precede something in order of time.

Once is a synonym for already in time topic. In some cases you can use "Once" instead the word "Already" as an adverb or an adjective, when it comes to topics like precede, before, earlier, formerly.

Once adverb - At an earlier or previous time.

Already is a synonym for once in time topic. You can use "Already" instead the word "Once" as an adverb or an adjective, if it concerns topics such as precede, before, earlier, formerly.