Word-of-mouth is a powerful marketing tool.

He has a dirty mouth.

The broad-mouthed frog caught a fly with ease.

The insect has specialized mouth-parts for feeding.

The insect uses its mouth-part to feed on nectar.

They have big mouths.

I need to buy some mouth wash.

There were a few mouth-breathers in the crowd.

She has been feeling down in the mouth since she lost her job.

Some people think mouth breathers are less intelligent than nose breathers.