Sponsion is a term used to refer to the act of sponsoring or assuming responsibility for something. When it comes to finding synonyms for this word, there are several options that can be used interchangeably in different contexts. These synonyms include patronage, support, backing, funding, endowment, financing, or underwriting. All these terms suggest an act of providing financial or moral support to a person, project, or idea. Depending on the context of use, one synonym may be more appropriate than the other. Overall, these words help to highlight the vital role that support and sponsorship play in ensuring the success of various endeavors.