publishing conglomerate vs publishing empire

publishing conglomerate and publishing empire both are nouns.

Word	Noun	Adjective	Verb	Adverb
publishing conglomerate	Yes	No	No	No
publishing empire	Yes	No	No	No

As nouns, publishing conglomerate and publishing empire are synonyms defined as:

publishing conglomerate and publishing empire: a conglomerate of publishing companies

publishing conglomerate (noun)	publishing empire (noun)
a conglomerate of publishing companies	a conglomerate of publishing companies