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The term for this is **autological word**.

> An **autological word** (also called **homological word**) is a word that expresses a property that it also possesses (e.g., "word" is a word, "noun" is a noun, "English" is an English word, "pentasyllabic" has five syllables, and "writable" is writable). The opposite is a **heterological** word, one that does not apply to itself (e.g. the word "long" is not long, "monosyllabic" has more than one syllable, "dactyl" is not a dactyl, and "misspelled" is not misspelled.)

Source: [Wikipedia](https://en.wikipedia.org/wiki/Autological_word)