Endeavour [en-dev-er]
Verb (used without object)
Verb (used with object)
Noun
Difference between Endeavour and Endeavor
Both of them are identical except a slight difference you should remember in order to use these words correctly: "Endeavor" is the US spelling, only used as a verb, whereas "endeavour" is the UK spelling that can be used both as a verb and as a noun.