A **company** is a business.
**Firm** is used for companies where there’s two or more people doing the same job. Like at my work, most of us have different titles and we do different jobs, but at a law firm all the main people are doing the same job: lawyering it up.
**Corporation** is legally a person itself.
An **enterprise** is just another word for company although it can also be used for a limited partnership between two companies. Like, building that bridge was a joint enterprise of company A and company B.
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