WordNet sense 1 (a sudden rapid flow (as of water)):

flush, outpouring

WordNet sense 2 (an unrestrained expression of emotion):

blowup, ebullition, effusion, outburst

WordNet sense 3 (gush forth in a sudden stream or jet):

spout, spurt, spirt

WordNet sense 4 (issue in a jet; come out in a jet; stream or spring forth):

jet

WordNet sense 5 (praise enthusiastically):

rave