bounce vs turn down

bounce is a noun but turn down is not a noun.

Word	Noun	Adjective	Verb	Adverb
bounce	Yes	No	Yes	No
turn down	No	No	Yes	No

As verbs, turn down is a hypernym of bounce; that is, turn down is a word with a broader meaning than bounce:

Other hypernyms of bounce include decline, pass up, refuse, reject.

bounce (noun)	turn down (noun)
a light, self-propelled movement upwards or forwards
the quality of a substance that is able to rebound
rebounding from an impact (or series of impacts)

bounce (verb)	turn down (verb)
eject from the premises	make lower or quieter
hit something so that it bounces	take a downward direction
spring back; spring away from an impact	reject with contempt
leap suddenly	not accept as true
move up and down repeatedly	refuse entrance or membership
come back after being refused
refuse to accept and send back