autological

An autological word (also called homological word or autonym) is a word that expresses a property that it also possesses (e.g. the word "short" is short, "noun" is a noun, "English" is English, "pentasyllabic" has five syllables, "word" is a word, "sesquipedalian" is a long word; see Wiktionary for ). The opposite is a heterological word, one that does not apply to itself (e.g. "long" is not long, "verb" is not typically a verb, "monosyllabic" has five syllables, "German" is not German, etc.).