Synonyms for Task:

n.

headache, necessity, struggle, burden, a tall order, the impossible, the elephant in the room, mare. dictate, command, office, require, duty, order around, stint, boss around, push around, order, tell, assignment, instruct, tax with. heavy. purpose, function, role, DO. drive, crack the whip. assignment (noun)
responsibility, stint, duty.
job or chore, often assigned (noun)
employment, toil, headache, work, duty, stint, function, project, office, assignment, burden, responsibility, enterprise, tax, effort, undertaking, occupation, labor.
task (noun)
job, undertaking, tax, project, chore, labor.
venture (noun)
activity, scheme, initiative, project, campaign, production, procedure, feat, endeavor, undertaking, maneuver, venture, pursuit, performance, exploit, adventure, deed, affair, enterprise.
work (noun)
effort, job, labor, chore, occupation, work, toil, employment.

v.

consumption (verb)
tax.

Other synonyms:

mare, headache, necessity, struggle. duty, stint, assignment. function, purpose, burden. office. drive. function
role.
Other relevant words:
drive, command, function, responsibility, role, headache, purpose, instruct, stint, necessity, office, order, mare, assignment, struggle, tax, require, dictate, DO, heavy, burden, duty, tell.

Usage examples for task

  1. Rather too difficult a task for both of you, I should think," says the Prince. – Erlach Court by Ossip Schubin
  2. The worst of his task had been to find the place; this no- man's place, but his. – Growth of the Soil by Knut Hamsun
  3. Ay, said Sir Adrian, and you and I, friend, will go too, and help this good fellow in his task – The Light of Scarthey by Egerton Castle