Nouns

(n)diligenceconscientiousness in paying proper attention to a task; giving the degree of care required in a given situation
(n)diligence, industriousness, industrypersevering determination to perform a task“his diligence won him quick promotions”, “frugality and industry are still regarded as virtues”
(n)application, diligencea diligent effort“it is a job requiring serious application”