cathode vs electrode

cathode and electrode both are nouns.

Word	Noun	Adjective	Verb	Adverb
cathode	Yes	No	No	No
electrode	Yes	No	No	No

As nouns, electrode is a hypernym of cathode; that is, electrode is a word with a broader meaning than cathode:

cathode: a negatively charged electrode that is the source of electrons entering an electrical device
electrode: a conductor used to make electrical contact with some part of a circuit

cathode (noun)	electrode (noun)
a negatively charged electrode that is the source of electrons entering an electrical device	a conductor used to make electrical contact with some part of a circuit
the positively charged terminal of a voltaic cell or storage battery that supplies current