Logical fallacy is a term that refers to an error in reasoning, where an argument fails to uphold the principles of logic. When it comes to synonyms for the term 'logical fallacy,' you may hear terms like flawed reasoning, faulty argument, or erroneous conclusions. Other synonyms that you may come across include false logic, invalid reasoning, and specious reasoning. Some people may also use terms like misconception, delusion, and fallacious reasoning to refer to instances of logical fallacy. The bottom line is that whenever you hear these terms, they typically refer to the same thing - a logical error in an argument or thought process.