publishing house vs publisher

publishing house and publisher both are nouns.

Word	Noun	Adjective	Verb	Adverb
publishing house	Yes	No	No	No
publisher	Yes	No	No	No

As nouns, publishing house and publisher are synonyms defined as:

Other synonyms of publishing house include publishing company, publishing firm.

publishing house (noun)	publisher (noun)
a firm in the publishing business	a firm in the publishing business
	a person engaged in publishing periodicals or books or music
	the proprietor of a newspaper