bond trading vs trading

bond trading and trading both are nouns.

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

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

bond trading: trading in bonds (usually by a broker on the floor of an exchange)
trading: buying or selling securities or commodities

bond trading (noun)	trading (noun)
trading in bonds (usually by a broker on the floor of an exchange)	buying or selling securities or commodities