General:
* Pant
* Sniff
* Inhale
* Aspirate
* Catch one's breath
* Suck in one's breath
More descriptive:
* Wheeze (suggesting difficulty breathing)
* Sob (suggesting sorrow or grief)
* Stifle (suggesting a struggle to breathe)
* Choke (suggesting a lack of air)
* Heave (suggesting a forceful intake of breath)
* Cackle (suggesting laughter)
* Whimper (suggesting fear or pain)
The best choice will depend on the specific context and the emotion you want to convey.