primary cell vs cathode

primary cell and cathode both are nouns.

Word	Noun	Adjective	Verb	Adverb
primary cell	Yes	No	No	No
cathode	Yes	No	No	No

primary cell (noun)	cathode (noun)
an electric cell that generates an electromotive force by an irreversible conversion of chemical to electrical energy; cannot be recharged	a negatively charged electrode that is the source of electrons entering an electrical device
	the positively charged terminal of a voltaic cell or storage battery that supplies current