stockbroker vs broker

stockbroker and broker both are nouns.

Word	Noun	Adjective	Verb	Adverb
stockbroker	Yes	No	No	No
broker	Yes	No	Yes	No

As nouns, broker is a hypernym of stockbroker; that is, broker is a word with a broader meaning than stockbroker:

stockbroker: an agent in the buying and selling of stocks and bonds
broker: a businessman who buys or sells for another in exchange for a commission

Other hypernyms of stockbroker include agent, factor.

stockbroker (noun)	broker (noun)
an agent in the buying and selling of stocks and bonds	a businessman who buys or sells for another in exchange for a commission

stockbroker (verb)	broker (verb)
	act as a broker