Logorrhea is a noun, and is used in a sentence as such. For an example of how to use this word, synonymous for incoherent or repetitious speech, can be found by continuing to read.
"Logorrhea is an essential component in political prose."
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Nothing at all. One is the excessive use of words and the other
is a medical condition.
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The (usually fictitious) condition is spelled logorrhea, which means constant and continuous speech, that is, wordiness, babbling or loquacity.