decease vs change state

decease is a noun but change state is not a noun.

Word	Noun	Adjective	Verb	Adverb
decease	Yes	No	Yes	No
change state	No	No	Yes	No

As verbs, change state is a hypernym of decease; that is, change state is a word with a broader meaning than decease:

decease: pass from physical life and lose all bodily attributes and functions necessary to sustain life
change state: undergo a transformation or a change of position or action

Other hypernyms of decease include turn.

decease (noun)	change state (noun)
the event of dying or departure from life

decease (verb)	change state (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	undergo a transformation or a change of position or action