seed tray vs receptacle

seed tray and receptacle both are nouns.

Word	Noun	Adjective	Verb	Adverb
seed tray	Yes	No	No	No
receptacle	Yes	No	No	No

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

seed tray: a tray used in horticulture for sowing and taking plant cuttings and growing plugs.
receptacle: a container that is used to put or keep things in

seed tray (noun)	receptacle (noun)
a tray used in horticulture for sowing and taking plant cuttings and growing plugs.	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