A friend of mine had his visa accepted because of this. He was explaining what he plans to do in US and he threw in “penultimate” into a sentence somewhere.

The council stopped him, said that if he knows such words he definitely won’t overstay his visit to work as a dishwasher, and accepted his B1/B2. Seriously.

Not sure if it would be the same if he used “defenestrate” when talking about his plans.