stock market vs securities market

stock market and securities market both are nouns.

Word	Noun	Adjective	Verb	Adverb
stock market	Yes	No	No	No
securities market	Yes	No	No	No

As nouns, stock market and securities market are synonyms defined as:

stock market and securities market: an exchange where security trading is conducted by professional stockbrokers

Other synonyms of stock market include stock exchange.

stock market (noun)	securities market (noun)
an exchange where security trading is conducted by professional stockbrokers	an exchange where security trading is conducted by professional stockbrokers