Discussion of tawjīh also mentions expressions open to interpretation from different perspectives. With some ambiguous expressions, one meaning may be more readily apparent and another more remote. But the defining rhetorical interest of tawjīh remains the possibility of opposed interpretations.
A word with several lexical meanings is not thereby automatically an instance of tawjīh. We must still ask whether its possible readings create meaningfully contrasting outcomes.
The wider study of ambiguity concerns multiplicity of meaning; tawjīh specifically draws rhetorical effect from contrasting readings of a single expression.