accumulator vs galvanic battery

accumulator and galvanic battery both are nouns.

Word	Noun	Adjective	Verb	Adverb
accumulator	Yes	No	No	No
galvanic battery	Yes	No	No	No

As nouns, galvanic battery is a hypernym of accumulator; that is, galvanic battery is a word with a broader meaning than accumulator:

accumulator: a voltaic battery that stores electric charge
galvanic battery: battery consisting of a number of voltaic cells arranged in series or parallel

Other hypernyms of accumulator include voltaic battery.

accumulator (noun)	galvanic battery (noun)
a voltaic battery that stores electric charge	battery consisting of a number of voltaic cells arranged in series or parallel
(computer science) a register that has a built-in adder that adds an input number to the contents of the register
a person who is employed to collect payments (as for rent or taxes)