When referring to one's former spouse, the term "ex husband" is commonly used. However, there are several synonyms that can be used in its place. Some popular options include "former spouse," "former partner," "former mate," and "former husband." Depending on the context and tone of the conversation, other alternatives such as "former significant other," "former companion," or simply "my ex" may be appropriate. It's important to choose a term that is respectful and accurately reflects the relationship that once existed between the two individuals.