death vs decease

death and decease both are nouns.

Word	Noun	Adjective	Verb	Adverb
death	Yes	No	No	No
decease	Yes	No	Yes	No

As nouns, death and decease are synonyms defined as:

Other synonyms of death include expiry.

death (noun)	decease (noun)
the act of killing	the event of dying or departure from life
the event of dying or departure from life
the permanent end of all life functions in an organism or part of an organism
the absence of life or state of being dead
a final state
the time when something ends
the time at which life ends; continuing until dead

death (verb)	decease (verb)
	pass from physical life and lose all bodily attributes and functions necessary to sustain life