This math problem is harder than the previous one.

He worked harder than anyone else in the office.

The harders in the aquarium are swimming gracefully.

John Harder is a common surname in the United States.

The Harders family has a long history in Germany.

The Harders are a family of talented musicians.

This victory was even harder-won than the last one.

She found it harder to put the puzzle together than she thought.

She deserves her harder-earned promotion.

He took a harder left turn and sped away.