Formal:
* Carry out: This is a very neutral synonym, emphasizing the completion of a task.
* Implement: This implies putting a plan or idea into action.
* Perform: This suggests a more deliberate and precise action.
* Effect: This focuses on the outcome or result of the action.
* Enact: This specifically refers to putting a law into action.
Informal:
* Do: This is a very general and straightforward synonym.
* Complete: This emphasizes the finality of the action.
* Finish: This is similar to "complete," but may suggest a more gradual process.
Other options:
* Fulfill: This suggests that the action is fulfilling a requirement or obligation.
* Achieve: This implies success in the completion of the action.
* Accomplish: This is similar to "achieve," but may suggest a more complex task.
The best synonym for "execute" will depend on the specific context of the sentence. For example, if you're talking about a legal execution, "carry out" or "perform" would be the most appropriate synonyms. If you're talking about executing a business plan, "implement" or "carry out" might be better choices.