light company vs electric company

light company and electric company both are nouns.

Word	Noun	Adjective	Verb	Adverb
light company	Yes	No	No	No
electric company	Yes	No	No	No

As nouns, light company and electric company are synonyms defined as:

light company and electric company: a public utility that provides electricity

Other synonyms of light company include power company, power service.

light company (noun)	electric company (noun)
a public utility that provides electricity	a public utility that provides electricity