Here are some examples of how "endeavor" can be used:
Verb:
* She endeavored to finish her work before the deadline.
* He endeavored to keep his anger under control.
Noun:
* It was a great endeavor to climb Mount Everest.
* Her life's endeavor was to help others.
Note: The word is often spelled "endeavor" in American English and "endeavour" in British English. Both spellings are correct.