The confusion of words which have only superficial likeness (in spelling or sound).
George W Bush and his father former US President George Bush are known for their verbal contortions. During "Perseverance Month", the son expressed his pleasure to be with a group schoolchildren for "Preservation Month" and proceeded "I appreciate preservation. It's what you do when you run for president. You gotta preserve." In a presidential campaign speech, he expressed a desire to "rip down terriers and bariffs". In a live national television interview, the father once refused to answer what he called a "hyporhetorical question" and later refused to "hypothecate", presumably a combination of hypothesize and speculate, on another reporter's enquiry.