To laugh in a stifled way
To smile or laugh scornfully or derisively
A stifled laugh
A facial expression or laugh conveying scorn or derision
The solemn moment was broken with a snicker that went around the room.
A snicker worked its way around the verandah.
Don't snicker, it happens in cities as large as Chicago.
"Toby, Mama," he said with a snicker.
Pete sprayed a mouthful of coffee with his snicker.