Answer:
The answer is indeed "an attempt."
Step-by-step explanation:
As a verb, "endeavor" means to try hard to achieve a goal. As a noun, it's synonym to "attempt", "venture", and "try", among others.
"Endeavor" originates from the Middle English word "devoir", meaning "to exert oneself".
An example with "endeavor" would be:
- The government has failed at the endeavor to reduce unemployment rates.