service firm vs service bureau

service firm and service bureau both are nouns.

Word	Noun	Adjective	Verb	Adverb
service firm	Yes	No	No	No
service bureau	Yes	No	No	No

As nouns, service firm and service bureau are synonyms defined as:

service firm and service bureau: a business that makes its facilities available to others for a fee; achieves economy of scale

Other synonyms of service firm include service agency.

service firm (noun)	service bureau (noun)
a business that makes its facilities available to others for a fee; achieves economy of scale	a business that makes its facilities available to others for a fee; achieves economy of scale