El profesor reprendió al alumno por soltar una risotada en medio de su clase.The teacher told the student off for letting out a guffaw in the middle of his class.
risotadas
A plural noun indicates that there is more than one person, place, thing, or idea.
Cuando comencé a cantar, escuché unas risotadas provenientes de la audiencia.When I started singing, I could hear some laughter coming from the audience.