endeavor

(n) a purposeful or industrious undertaking (especially one that requires effort or boldness)
- he had doubts about the whole enterprise
endeavour, enterprise,
(n) earnest and conscientious activity intended to do or accomplish something
- made an effort to cover all the reading material
- wished him luck in his endeavor
- she gave it a good try
attempt, effort, try, endeavour,

(v) attempt by employing effort
- we endeavor to make our customers happy
endeavour, strive,

endeavour strive enterprise attempt effort try