What's the noun for laughingly? Here's the word you're looking for.
laughter
The sound of laughing, produced by air so expelled; any similar sound.
A movement (usually involuntary) of the muscles of the laughing face, particularly of the lips, and of the whole body, with a peculiar expression of the eyes, indicating merriment, satisfaction or derision, and usually attended by a sonorous and interrupted expulsion of air from the lungs.
“He lookedat me fora few seconds, with eyes like those of an inquisitive owl or curious herring, then suddenly burst into a peal of rumblesome laughings.”