Stockbrokerage rhymes with:
acreage, brokerage, acreage, alderidge, amperage, average, betteridge, beverage, beveridge, brokerage, deatherage, detherage, everage, hemorrhage, leverage, pilferage, seigniorage, sewerage, underage
Stockbrokerage sounds like:
stockbroker's, stockbrokerages, stockbrokers, stockbrokers'