IPA: /ˈlɪtəˌrətər/
KK: /ˈlɪtəˌrɪtər/
A person who is involved in writing or literary activities, such as a writer, critic, or essayist.
The litterateur published several essays on modern literature.
Litterateur → It is derived from the French word 'littérateur', which comes from 'littérature' (meaning literature) and the suffix '-eur' (meaning one who). A litterateur is one who is engaged in literature or literary pursuits.
Think of someone who is deeply involved in 'literature' ('littérature') — that's what a litterateur is, a person dedicated to literary work.