endeavor
noun
a purposeful or industrious undertaking (especially one that requires effort or boldness)
“he had doubts about the whole enterprise”
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”
verb
attempt by employing effort
“we endeavor to make our customers happy”
Source: WordNet 3.1, Princeton University