The role of an aunt's husband is an important one in many families. However, it can be tricky to find the right word to describe this relative. Some common synonyms for aunt's husband include uncle-in-law, uncle by marriage, and auntie's partner. While these all convey the same general idea, they each have their own nuances and connotations. For instance, uncle-in-law can imply a more distant or less familial relationship, while auntie's partner may suggest a closer bond or long-term commitment. Ultimately, the best synonym for aunt's husband depends on the context and the relationship between the individuals involved.