Nouns

(n)undertaking, project, task, labor, labourany piece of work that is undertaken or attempted“he prepared for great undertakings”
(n)job, task, chorea specific piece of work required to be done as a duty or for a specific fee“estimates of the city's loss on that job ranged as high as a million dollars”, “the job of repairing the engine took several hours”, “the endless task of classifying the samples”, “the farmer's morning chores”

Verbs

(v)taskassign a task to“I tasked him with looking after the children”
(v)tax, taskuse to the limit“you are taxing my patience”