Refluent is not a very common word with few synonyms available. However, some words that can be used in place of refluent include flowing back, ebbing, receding, reversing, and returning. These words are often used to describe the movement of water, as refluent itself comes from the Latin word "refluere" which means to flow back. The term may also be used in a more figurative sense to describe something that is moving back or returning to a previous state. Overall, while the vowel-rich refluent may not have many obvious alternatives, these related synonyms can help to convey a similar meaning in different contexts.