No matter it is a homophone (phonogram) or a polysemous word, the point of the speaker is not the "similarity" but the equivocality.

不管是同(谐)音还是同词，说话人要表达的重点不在“同”上而在歧义上。

The rhetorical device-pun intentionally uses homophone (phonogram) and polysemous words which can possible generate equivocality in order to punningly express what the speaker is really driving at.

双关辞格有意利用同(谐)音词与一词多义的词可能引起的歧义来达到一语双关地表述说活人真实意图的目的.