nicad vs storage battery

nicad and storage battery both are nouns.

Word	Noun	Adjective	Verb	Adverb
nicad	Yes	No	No	No
storage battery	Yes	No	No	No

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

nicad: a rechargeable battery with a nickel cathode and a cadmium anode; often used in emergency systems because of its low discharge rate when not in use
storage battery: a voltaic battery that stores electric charge

Other hypernyms of nicad include accumulator.

nicad (noun)	storage battery (noun)
a rechargeable battery with a nickel cathode and a cadmium anode; often used in emergency systems because of its low discharge rate when not in use	a voltaic battery that stores electric charge