The term "previous husband" is commonly used to refer to a person's ex-spouse. However, there are many other synonyms for this term that can be used depending on the context and tone of the conversation. Some examples include "former husband," "ex-husband," "former partner," "ex-partner," "previous spouse," and "former mate." Each of these synonyms conveys a slightly different nuance and level of formality, so it's important to choose the appropriate term for the situation. Ultimately, the choice of words depends on the speaker's preference and the level of respect they wish to convey towards their former partner.