Onanist is a word that refers to a person who indulges in self-gratification, commonly known as masturbation. However, there are other words that mean the same thing. Some of the synonyms for onanist include self-pleasurer, self-abuser, and self-gratifier. Other synonyms that can be used to describe this behavior include self-stimulation, autoeroticism, self-love, and solitary vice. While these words are not as commonly used as onanist, they can be useful when writing on sensitive topics related to human sexuality or addiction. Regardless of the wording used, it is important to approach the topic of masturbation with sensitivity and respect.