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Taskmaster

//ˈtæskˌmæstɚ// noun

Noun

1
Someone who supervises workers, especially one who imposes hard or burdensome work.
"And the Lord said, I have surely seen the affliction of my people which are in Egypt, and have heard their cry by reason of their taskmasters; for I know their sorrows"
2
someone who imposes hard or continuous work wordnet
3
A source of hard work or responsibility. figuratively
"It all looked so easy when the competent were at the helm, but reality is a cruel taskmaster, and all the excuses that worked as an underling wear thin once the incompetent are in leadership roles."

From task + master.

Unscramble this word: taskmaster