General:
* Task: This is a neutral and widely used term.
* Chore: This implies a routine or household duty.
* Job: This can refer to a specific piece of work or a general occupation.
* Assignment: This suggests a specific task given to someone.
* Project: This implies a larger, more complex undertaking.
* Undertaking: This is a formal word for a task or project.
* Effort: This emphasizes the amount of work required.
* Stint: This refers to a specific period of work.
Informal:
* Gig: This is informal and usually refers to a temporary job.
* Hunk of work: This is a more informal and slightly humorous way of saying "bit of work."
* Thing to do: This is a very casual way of saying "bit of work."
* To-do: This refers to something on a list of tasks.
More specific:
* Obligation: This implies a duty or responsibility.
* Challenge: This suggests a task that is difficult or demanding.
* Problem: This implies a difficult task that needs to be solved.
* Workload: This refers to the total amount of work someone has.
The best word to use will depend on the specific situation and the meaning you want to convey.