Ambiguity

In an ambiguity fallacy a word or phrase is used uncleanly. There are two ways in which this may occur:

• The word or phrase may be ambiguous, in which case it has more than one distinct meaning.
• The word or phrase may be vague, in which case it has no distinct meaning.

Equivocation

The same word is used with two different meanings. For example:

"Criminal actions are illegal, and all murder trials are criminal actions, thus all murder trials are illegal."

"The sign said 'fine for parking here', and since it was fine, I parked there."

Source

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