WordNet sense 1 (a chance to do something):

shot

WordNet sense 2 (a long narrow depression in a surface):

chap, cranny, crevice, fissure

WordNet sense 3 (a long narrow opening):

cleft, scissure

WordNet sense 4 (a sudden sharp noise):

snap, cracking

WordNet sense 5 (witty remark):

quip, sally, wisecrack

WordNet sense 6 (a narrow opening):

gap

WordNet sense 7 (a purified and potent form of cocaine that is smoked rather than snorted):

tornado

WordNet sense 8 (of the highest quality):

ace, fantastic, first-rate, super, tiptop, topnotch, A-one, tops

WordNet sense 9 (of high or superior quality or performance):

superior

WordNet sense 10 (suffer a nervous breakdown):

collapse, break up, crack up, crock up

WordNet sense 11 (a usually brief attempt):

fling, go, offer, pass, whirl

WordNet sense 12 (pass through (a barrier)):

break through

WordNet sense 13 (the act of cracking something):

fracture

WordNet sense 14 (become fractured; break or crack on the surface only):

break, check