The market: 
the stock market.

Stock market: 
An organized market where securities are traded; Stock exchange.

Stock:
Money or capital invested or available for investment or trading.

Mutual fund: 
An open-end investment company that invests its shareholders¹ money in a usually diversified group of other corporations securities.

Dividends: 
A share in stockholders¹ profits.

Portfolio: 
A collection securities held by an investor.