There are a variety of synonyms for the term "time payment plan." Some people might refer to it as a "monthly installment plan," while others might use the term "layaway arrangement." Another common synonym is "deferred payment plan," which is when the buyer agrees to pay for their purchase at a later date, after they have had time to use or receive the item in question. Some retailers might also offer a "payment plan" or "financing option" that allows customers to spread out the cost of their purchase over a longer period of time. Ultimately, the specific synonym used might vary depending on the context and industry in question.