Tawriyah normally involves an apparent nearer sense of a word and an intended more remote sense.
Tawjīh makes the entire statement susceptible to two different readings, with the tension itself providing the effect.
FigureDistinctive mechanism
TawriyahNear impression; remote intention
TawjīhTwo divergent viable readings
Bare obscurity is not enough: the alternative readings must be meaningful and supported by the context.