Synonyms for Accumulator (same or very similar meaning)
WordNet sense 1 (a person who is employed to collect payments (as for rent or taxes)):
collector, gathererWordNet sense 2 (a voltaic battery that stores electric charge):
storage batteryWordNet sense 3 ((computer science) a register that has a built-in adder that adds an input number to the contents of the register):
accumulator registerFrom the ODE community, based on WordNetadd/edit