investment company vs investment firm

investment company and investment firm both are nouns.

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

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

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

Other synonyms of investment company include fund, investment trust.

investment company (noun)	investment firm (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