vacuum tube vs grid

vacuum tube and grid both are nouns.

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

vacuum tube (noun)	grid (noun)
electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope	a cooking utensil of parallel metal bars; used to grill fish or meat
	an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube
	a system of high tension cables by which electrical power is distributed throughout a region
	a perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material
	a pattern of regularly spaced horizontal and vertical lines