Qahqahah is audible laughter heard by someone nearby; dahk is laughter audible to oneself but not a neighbor; tabassum is a silent smile.
In the specified prayer context, loud laughter invalidates both prayer and wudu for an adult. Lower audible laughter invalidates prayer but not wudu, and silent smiling invalidates neither.
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Invalidators of Wudu: Actual and Constructive Causes
Qahqahah is audible laughter heard by someone nearby; dahk is laughter audible to oneself but not a neighbor; tabassum is a silent smile.
In the specified prayer context, loud laughter invalidates both prayer and wudu for an adult. Lower audible laughter invalidates prayer but not wudu, and silent smiling invalidates neither.