hard work
compound. A1 Beginner Oxford
compound. Using a lot of energy and effort to do a job or task.
compound. A significant expenditure of physical or mental effort.
Success requires hard work.
Becoming a doctor takes years of hard work and dedication.
Her promotion was a testament to her relentless hard work, often staying late to ensure every detail was perfect.
Usage
This is an uncountable noun phrase.
Teaching tip
Contrast 'hard work' (the uncountable effort) with 'a hard job' (a countable, difficult task or position).
Pitfall
She did many hard works to finish the project.She did a lot of hard work to finish the project.'Hard work' is an uncountable noun, so it cannot be made plural.