(also known as: UME)
Description: Confusing the word used to describe a thing, with the thing itself. To avoid this error, it is customary to put the word used to describe the thing in quotes.
This fallacy is most common when used as an equivocation.
“X” is the same as X.
My son is made up of five letters.
Explanation: The words (mention), “my son”, are made up of five letters. My son (use) is made up of molecules.
Example #2: Anselm's Ontological Argument
p1. God is that than which nothing greater can be conceived.
p2. God may exist in the understanding.
p3. To exist in reality and in the understanding is greater than to exist in the understanding alone.
p4. Therefore, God exists in reality.
Explanation: In premise #1, God (use) refers to the being -- this is the whole point of Anselm’s argument, but in premise #2, he equivocates to the concept of God (mention).