program trading vs trading

program trading and trading both are nouns.

Word	Noun	Adjective	Verb	Adverb
program trading	Yes	No	No	No
trading	Yes	No	No	No

As nouns, trading is a hypernym of program trading; that is, trading is a word with a broader meaning than program trading:

program trading: a trading technique involving large blocks of stock with trades triggered by computer programs
trading: buying or selling securities or commodities

program trading (noun)	trading (noun)
a trading technique involving large blocks of stock with trades triggered by computer programs	buying or selling securities or commodities