IPA: /ˈstɒkˌbrəʊkə/
KK: /ˈstɑkˌbroʊkər/
A person who helps others buy and sell shares in companies and other financial assets.
She works as a stockbroker, helping clients invest their money wisely.
Stockbroker → It is formed from "stock" (from Old English *stocc*, meaning a tree trunk or a supply) and "broker" (from Old French *broceur*, meaning a small trader or dealer). The word "stockbroker" refers to a dealer or trader in stocks or shares, which are supplies of ownership in companies.
Think of a 'stock' as a supply or ownership in a company, and a 'broker' as someone who trades or deals. A stockbroker is someone who trades in these supplies.
No commonly confused words.