Merriam-Webster reports that searches for the word misnomer rose 9000% January 4. The reason:
Lookups rose over 9000%
JAN 4, 2018
Misnomer found itself, blinking and confused, at the very top of our lookups on January 4th, 2018; the word was propelled there not by any virtue or design of its own, but rather through an apparent misuse by President Donald Trump.
Mr Trump later said to reporters on Mr Bannon: "He called me a great man last night. So he obviously changed his tune pretty quick. I don’t talk to him ... that’s just a misnomer.”
— Ben Riley-Smith, The Telegraph, 4 Jan. 2018
All currently defined senses of 'misnomer' involve use of the wrong name.
Yes, DJT didn’t know how to use misnomer in a sentence. He misspoke, he made a mistake despite going to the best schools. He tried to use a big word to impress but didn’t send his best genius.
While DJT’s misuse of misnomer is hardly 25th Amendment actionable, it does give one pause. What if Trump uses a wrong word in a tweet that North Korea’s very stable genius Kim jong-un misinterprets?
Perhaps Merriam-Webster should pre-check all of Trump's future tweets for meaning.