relapse vs change state

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

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

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

Other hypernyms of relapse include turn.

relapse (noun)	change state (noun)
a failure to maintain a higher state

relapse (verb)	change state (verb)
go back to bad behavior	undergo a transformation or a change of position or action
deteriorate in health