Back talk, 4 letters
Bunk, 4 letters
Humbug, 4 letters
Insolence, 4 letters
Insolent talk, 4 letters
Lip, 4 letters
Malarkey, 4 letters
Nonsense, 4 letters
Sass, 4 letters
Verbal abuse, 4 letters
A ludicrously false statement, 4 letters
Belly laugh, 6 letters
Boisterous laugh, 6 letters
Hearty chuckle, 6 letters
Horselaugh, 6 letters
Laugh loud and long, 6 letters
Loud laugh, 6 letters
A burst of deep loud hearty laughter, 6 letters
Belly laughs, 7 letters
Bursts of deep, loud laughter, 7 letters
Roars, 7 letters
Way more than giggles, 7 letters