I've always been amused by words like "monosyllabic" which are self-contradictory in the sense that the word itself is not, in fact, one syllable. "Palindrome" is another example. (Palindrome, contrary to its definition, does not read the same forwards and backwards.)
At one point I remember having at least two other similar examples, which I can no longer recall.
Is there a specific term for words that are themselves a counterexample of the concept they represent and are there other such words?