Is laughter an adjective or a verb?

1. laugh; laugh

They laughed at their failure.

They laughed off their failure.

These jokes made everyone laugh.

Those jokes made everyone laugh.

transitive verb

1. Show with a smile

He smiled and agreed.

He smiled in agreement.

2. Smile [O8]

We laughed ourselves hoarse.

We laughed ourselves hoarse.

3. Force each other with ridicule [O]

The poor actor was laughed off the stage.

The poor actor was driven off the stage by laughter.

noun

1. Laugh, laugh

She smiled heartily.

She laughed heartily.

2. Something that makes people laugh

This interesting book has a punch line on every page.

Every page of this interesting book has something interesting.

/s？ laugh