Stipula is a term that is commonly used in various fields like legal, financial, academic, and others. If you're looking for other words that can be used in place of stipula, there are several synonyms worth using. Instead of stipula, you can use words like agreement, contract, covenant, or promise. You can also use the words obligation, commitment, undertaking, or deal. If you want a more formal-sounding synonym for stipula, you can go with the word deed. The beauty of having synonyms for words like stipula is that you can convey the same message using various words, providing you with more options for your writing.