investment firm vs investment company

investment firm and investment company both are nouns.

Word	Noun	Adjective	Verb	Adverb
investment firm	Yes	No	No	No
investment company	Yes	No	No	No

As nouns, investment firm and investment company are synonyms defined as:

investment firm and investment company: a financial institution that sells shares to individuals and invests in securities issued by other companies

Other synonyms of investment firm include fund, investment trust.

investment firm (noun)	investment company (noun)
a financial institution that sells shares to individuals and invests in securities issued by other companies	a financial institution that sells shares to individuals and invests in securities issued by other companies