public-service corporation vs public utility

public-service corporation and public utility both are nouns.

Word	Noun	Adjective	Verb	Adverb
public-service corporation	Yes	No	No	No
public utility	Yes	No	No	No

As nouns, public-service corporation and public utility are synonyms defined as:

public-service corporation and public utility: a company that performs a public service; subject to government regulation

Other synonyms of public-service corporation include public utility company, utility.

public-service corporation (noun)	public utility (noun)
a company that performs a public service; subject to government regulation	a company that performs a public service; subject to government regulation