A fallacy of language that occurs when a word is used in two different senses and the meaning of the word is shifted during the argument.

intentionally vague or ambiguous

falsification by means of vague or ambiguous language

a bad form of argument where one of the key terms can be understood in two ways, and the plausibility of the argument depends on reading the term differently in different premises

an argument that uses two different premises, U and V, that seem to mean the same thing, when they do not

The use o equivocal language, e.g., words capable of two interpretations, cryptic, evasive, ambiguous.

Also known as ambiguity, Equivocation is a logical fallacy. It is committed when someone uses the same word in different meanings in an argument, implying that the word means the same each time around.