General Laughter:
* chuckle
* giggle
* snicker
* guffaw
* roar
* cackle
* titter
* chortle
* grin
* smile
More Specific Laughter:
* Nervous Laughter: giggle, titter, nervous laugh
* Loud Laughter: guffaw, roar, cackle
* Joyful Laughter: chuckle, giggle, chortle
* Condescending Laughter: snicker, sneer
* Sarcastic Laughter: smirk, scoff
* Quiet Laughter: chuckle, smile, grin
Other Expressions:
* Be amused: This implies a feeling of lightheartedness or enjoyment.
* See the humor in something: This suggests a recognition of the funny aspect of a situation.
* Find something funny: This is a more direct way of saying you enjoyed a joke or situation.
The best word choice will depend on the specific situation and the feeling you want to convey.