There aren't any universally agreed-upon definitions. Some people use "sober" to mean simply not drinking. Some use it only to mean physical, emotional and spiritual sobriety--healthy in all three spheres. In that sense it would be much more than merely "not drinking."
Similarly, some people consider themselves "in recovery" for life--as long as they continue to do the necessary work, and to grow. Others consider themselves "recovered" once they reach a certain point of stable sobriety, even though further personal growth is something they continue to work on.
The labels don't really matter, but people around here can get very hung up on the "proper" use of certain words. It helps to avoid misunderstandings and hurt feelings here on the forums to be aware that you may say and mean one thing, and someone else might be "hearing" you say something entirely different. And vice-versa, of course.