in-tray vs receptacle

in-tray and receptacle both are nouns.

Word	Noun	Adjective	Verb	Adverb
in-tray	Yes	No	No	No
receptacle	Yes	No	No	No

As nouns, receptacle is a hypernym of in-tray; that is, receptacle is a word with a broader meaning than in-tray:

in-tray: a wood or metal receptacle placed on your desk to hold your incoming material
receptacle: a container that is used to put or keep things in

in-tray (noun)	receptacle (noun)
a wood or metal receptacle placed on your desk to hold your incoming material	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