Ocha - green tea
tduke/zuke - soak
In fact you call every boiled rice poured with green tea ochazuke.
However usually ochazuke inclueds not only rice and tea, but also season vegetables, pickles, nori, and wasabi.
In good restaurant they use even specially prepared consommé instead of tea.
At home many people use powder ochazuke, so that you can pour either only hot water or green tea on the rice.