When you're looking for a suitable synonym for "former husband," you have a number of options to choose from. For instance, you might use the term "ex-husband," which is perhaps the most common way to refer to a man who was once married to someone. Another potential synonym is "previous spouse," which captures the idea that a person was once married to this individual but is no longer. Other possible terms include "former mate" and "past husband," both of which have a more general connotation and may fit well in certain contexts. Whatever term you choose, it's important to remember that each one carries its own set of nuances and connotations.