bond-trading activity vs bond trading

bond-trading activity and bond trading both are nouns.

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

As nouns, bond-trading activity and bond trading are synonyms defined as:

bond-trading activity and bond trading: trading in bonds (usually by a broker on the floor of an exchange)

bond-trading activity (noun)	bond trading (noun)
trading in bonds (usually by a broker on the floor of an exchange)	trading in bonds (usually by a broker on the floor of an exchange)