coin box vs receptacle

coin box and receptacle both are nouns.

Word	Noun	Adjective	Verb	Adverb
coin box	Yes	No	No	No
receptacle	Yes	No	No	No

As nouns, receptacle is a hypernym of coin box; that is, receptacle is a word with a broader meaning than coin box:

coin box: the part of a slot machine that serves as a receptacle for the coins
receptacle: a container that is used to put or keep things in

coin box (noun)	receptacle (noun)
the part of a slot machine that serves as a receptacle for the coins	a container that is used to put or keep things in
	an electrical (or electronic) fitting that is connected to a source of power and equipped to receive an insert
	enlarged tip of a stem that bears the floral parts