deceased vs departed

deceased and departed both are nouns.

Word	Noun	Adjective	Verb	Adverb
deceased	Yes	Yes	No	No
departed	Yes	Yes	No	No

As adjectives, deceased and departed are synonyms defined as:

Other synonyms of deceased include asleep, at peace, at rest, gone.

As nouns, deceased and departed are synonyms defined as:

Other synonyms of deceased include dead person, dead soul, deceased person, decedent.

deceased (noun)	departed (noun)
someone who is no longer alive	someone who is no longer alive

deceased (adjective)	departed (adjective)
dead	dead
	well in the past; former