The word polysyllabic is autological, but the word monosyllabic is not.
Source: wiktionary
Autological
/ˌɔː.təʊˈlɒ.dʒɪ.kəl/
Synonyms for "autological"
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Sample sentences
3 total sentences available.
Because the word short is in fact short, it is considered autological.
Source: wiktionary
The word noun is itself a noun, and is thus autological.
Source: wiktionary