Stock Trader Day Trading

stock trader
A stock trader or a stock investor is an individual or firm who buys and sells stocks or bonds (and possibly other financial assets) in the financial markets.
someone who buys and sells stock shares
(Stock trading) Commonly connotes short-term buying and selling of stock (by a stock trader) but is also used in the general sense of the act of buying and selling shares. More

day trading
(Day traders) hold stocks for minutes to hours making numerous trades each day usually with a cursory understanding of the companies they trade.  These investors rely on timing and minimize risk by buying and then immediately selling.
The buying and selling of securities on the same day, often online, on the basis of small, short-term price fluctuations
Day trading refers to the practice of buying and selling financial instruments within the same trading day such that all positions are usually closed before the market close for the trading day. Traders that participate in day trading are called active traders or day traders.
(Day traders) come to market each day flat (no position) and leave the day flat. Their behavior is very short-term and often emotional.