laughThe children were laughing at the cartoons.
chuckleShe was chuckling as she read the letter.
sniggerThey sniggered at what she was wearing.
snickerUSStop snickering at that rude joke and get back to your classwork.
chortleShe chortled with glee at the news.
crack upinformalI just cracked up when I saw him in that hat.
burst out laughingI fell over the chair and everyone burst out laughing.
in stitchesinformalHis jokes had us all in stitches.