1, company is the most commonly used word for "company", which usually refers to "formally registered company" and consists of "shareholders".
My sister works in a large international company.
My sister works in a large multinational company.
Firm, especially a small company or firm, usually refers to "firm".
I have moved to an accounting firm in Paris.
I changed my job and now I am in an accounting firm in Paris.
3. Enterprises usually refer to "small and medium-sized enterprises that have just started" and are not necessarily officially registered companies.
Many enterprises in this area rely on the support of the local government.
Many local enterprises rely on the support of local governments.
Second, the breadth of meaning is different.
1, company
English? ['k？ mp(？ )n？ ] beautiful? ['k？ mp？ Ni]?
Company; A companion, a companion; company
2. Be firm
English? [fm] beautiful? 【f？ m]？
Firm; Firm; Firm; Strict; burly
Make firm; stouten
firmly
Company; shop
3. Enterprises
English? ['ent？ pra？ Z] beautiful? ['? nt？ pra？ z]？
Enterprise; Career; Enterprise; entrepreneur spirit
Third, morphemes are different.
1, company
Only plural: company
2. Be firm
Third person singular: company plural: company present participle: firm past tense: firm past participle: firm comparative: firmer superlative: firmest.
3. Enterprises
Only plural: enterprise