publishing company vs publishing house

publishing company and publishing house both are nouns.

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

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

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

Other synonyms of publishing company include publisher, publishing firm.

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