WordNet sense 1 (a natural flow of ground water):

fountain, outflow, spring, natural spring

WordNet sense 2 (a sudden rapid flow (as of water)):

flush, gush

WordNet sense 3 (the pouring forth of a fluid):

discharge, run, discharge

WordNet sense 4 (the rapid and continuous delivery of linguistic communication (spoken or written)):

barrage, bombardment, onslaught

WordNet sense 5 (a large flow):

flood, overflow