self-descriptive
An adjective meaning "It describes itself", the meaning of some words describe the word itself, for example:
cool is a cool word
arcane is an arcane word
dull is a dull word
monosyllabilic is not a monosyllabilic word
So cool, arcane and dull are all self-descriptive words
arcane is an arcane word
dull is a dull word
monosyllabilic is not a monosyllabilic word
So cool, arcane and dull are all self-descriptive words