Pediluvium is a word that refers to the act of soaking a person's feet in water. When trying to find synonyms for this word, some options include footbath, foot soak, or even a tepidarium. Additionally, pedicure is another word that connects to the concept of soaking and treating feet. Similar words that pertain to overall hygiene and self-care would be bath, soak, or shower. However, for more specialized contexts, one might use words such as ionic detox, ion cleanse, or aromatherapy foot soak. Regardless of the chosen synonym, each word captures the essence of taking time to pamper and care for one's feet.