electrical system vs electrical plant

electrical system and electrical plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
electrical system	Yes	No	No	No
electrical plant	Yes	No	No	No

As nouns, electrical system and electrical plant are synonyms defined as:

electrical system and electrical plant: utility that provides electricity

electrical system (noun)	electrical plant (noun)
equipment in a motor vehicle that provides electricity to start the engine and ignite the fuel and operate the lights and windshield wiper and heater and air conditioner and radio	utility that provides electricity
utility that provides electricity