agent vs securities firm

agent and securities firm both are nouns.

Word	Noun	Adjective	Verb	Adverb
agent	Yes	No	No	No
securities firm	Yes	No	No	No

agent (noun)	securities firm (noun)
the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause	a stock broker's business; charges a fee to act as intermediary between buyer and seller
an active and efficient cause; capable of producing a certain effect
a businessman who buys or sells for another in exchange for a commission
a representative who acts on behalf of other persons or organizations
any agent or representative of a federal agency or bureau
a substance that exerts some force or effect