Interior silence
It is absurd to talk about interior silence when there is no exterior silence.
A contemplative practice is any act, habitually entered into with your whole heart, as a way of awakening, deepening, and sustaining a contemplative experience of the inherent holiness of the present moment. The critical factor is not so much what the practice is in its externals as the extent to which the practice incarnates an utterly sincere stance of awakening and surrendering to the Godly nature of the present moment.