publishing house vs publishing company

publishing house and publishing company both are nouns.

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

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

publishing house and publishing company: a firm in the publishing business

Other synonyms of publishing house include publisher, publishing firm.

publishing house (noun)	publishing company (noun)
a firm in the publishing business	a firm in the publishing business