This was a fun little exercise I did the other day. The following is a list of 5 terms which are, by their written nature, self-defining:

1. Polysyllabic
2. Word
3. Legible
4. Noun
5. Visible

On the other hand, consider the contradiction found in their antonyms:

1. Monosyllabic
2. Number
3. Illegible
4. Verb
5. Invisible

Can you think of others?