Soon
In a short time
Synonyms: In a short time, presently, before long, in a minute, in an instant, in the twinkling of an eye, any minute (now), any time (now), pronto, in no time (at all), in two shakes, sharpish, in two ticks, anon, shortly, in the near future, in a little while, in a moment, in a twinkling, before you know it, any day (now), by and by, in (less than) no time, in a jiffy, in two shakes of a lamb's tail, in a tick, directly, and ere long.
Early
Synonyms: Early, promptly, punctually, earlier, beforehand, in readiness, already, quickly, speedily, by when, before, in advance, and ahead of time.
Rather
Synonyms: Rather, preferably, more willingly, if I had my druthers, by preference, from/by choice, and more readily.
Example Sentences
Dinner will be ready soon, almost done.
She'll be home soon, just be patient.
The movie will start soon, don't worry.
I'll finish my homework soon, I promise.