in-basket vs in-tray

in-basket and in-tray both are nouns.

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

As nouns, in-basket and in-tray are synonyms defined as:

in-basket and in-tray: a wood or metal receptacle placed on your desk to hold your incoming material

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