WordNet sense 1 (the occurrence of surplus liquid (as water) exceeding the limit or capacity):

runoff, overspill

WordNet sense 2 (flow or run over (a limit or brim)):

overrun, overrun, run over, brim over, well over

WordNet sense 3 (overflow with a certain feeling):

bubble over, spill over

WordNet sense 4 (a large flow):

flood, outpouring