General shouting:
* Shouted
* Yelled
* Howled
* Roared
* Bellowed
Expressing fear or pain:
* Cried out
* Screeched
* Squealed
* Wailed
* Gasped
Expressing anger or excitement:
* Exclaimed
* Proclaimed
* Declared
* Shrilled
* Whooped
More subtle expressions:
* Called out
* Spoke loudly
* Utterred
* Said sharply
The best word to use will depend on the specific situation and the emotion you want to convey.