The hardnesses of the materials vary depending on their composition.

He lives hard by the river.

He had a hard on for her.

His last name is Hard.

She's been hard at it all day, trying to finish the project.

The try-hards in the competition were determined to win at all costs.

The blow-hards at the party wouldn't stop talking about themselves.

The die-hards never gave up on their team, even when they were losing.

He is such a try-hard when it comes to video games.

He has a hard and fast rule about not eating after 8pm.