electricity vs low-voltage

electricity is a noun but low-voltage is not a noun.

Word	Noun	Adjective	Verb	Adverb
electricity	Yes	No	No	No
low-voltage	No	Yes	No	No

electricity (noun)	low-voltage (noun)
keen and shared excitement
a physical phenomenon associated with stationary or moving electrons and protons
energy made available by the flow of electric charge through a conductor

electricity (adjective)	low-voltage (adjective)
	subjected to or capable of operating under relative low voltage