What is another word for laugh loudly?

General:

* Roar

* Guffaw

* Howl

* Chortle

* Cackle

* Snort

* Belly laugh

* Giggle (can be loud, but often more lighthearted)

Informal:

* Crack up

* Bust a gut

* Die laughing

The best word depends on the context and the tone you want to convey.