tube vs control grid

tube and control grid both are nouns.

Word	Noun	Adjective	Verb	Adverb
tube	Yes	No	Yes	No
control grid	Yes	No	No	No

tube (noun)	control grid (noun)
conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases	an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube
an electric railway operating below the surface of the ground (usually in a city)
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)	control grid (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