There is an irony, and whimsy, to words.
The word accessibility is not very accessible.
“Monosyllabic” is an adjective used to describe a word consisting of only one syllable. The word monosyllabic consists of five syllables.
Hippopotomonstrosesquippedaliophobia is a word for the fear of long words. Yes, really.
And literally don't get me started on the word "literally".
But do hit me with your favorite examples of this phenomenon.