There was a hubbub of voices in the crowded room.

The children's laughter and excitement created a hubbub in the classroom.

The hubbubs of the city filled the air.

The children hubbubed in the playground.

The children were hubbubing in the playground.

The children hubbubbed loudly in the playground.

She was hubbubbing around the room, trying to find her lost keys.

The hubbuboos in the park were causing a lot of noise.

The hubbuboo in the pub was deafening.