tube vs cathode

tube and cathode both are nouns.

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

tube (noun)	cathode (noun)
conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases	a negatively charged electrode that is the source of electrons entering an electrical device
an electric railway operating below the surface of the ground (usually in a city)	the positively charged terminal of a voltaic cell or storage battery that supplies current
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
(anatomy) any hollow cylindrical body structure
a hollow cylindrical shape

tube (verb)	cathode (verb)
place or enclose in a tube
convey in a tube
ride or float on an inflated tube
provide with a tube or insert a tube into