Pecuniary is an adjective that refers to anything related to money or financial matters. Some synonyms of pecuniary are financial, economic, monetary, fiscal, commercial, and budgetary. These words can be used interchangeably with pecuniary depending on the context. Financial and monetary usually refer to large sums of money or the economy as a whole. Fiscal and budgetary are more specific terms, referring to government spending and budget management. Commercial is used in the business field to describe transactions and trade. Using synonyms can help to diversify your language and make your writing more interesting.