pant, puff, heave, catch one's breath, start, blow, breath, suck, explode, grab some air, more...

exhale, breaout, sigh

surprised gasp, shocked gasp, disbelief gasp, amazed gasp, excited gasp, appalled gasp, astonished gasp, terrified gasp, more...

last, little, collective, audible, small, sudden, quick, loud, sharp, final, involuntary

catch one's breath,   shaky breath,   inhale sharply,   breath hitched,   say breathlessly,   sound of surprise,   hitched breath,   sharp inhale,   surprised noise,   exhale sharply