fluctuate vs change state

fluctuate and change state both are verbs.

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

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

Other hypernyms of fluctuate include turn.

fluctuate (verb)	change state (verb)
be unstable	undergo a transformation or a change of position or action
move or sway in a rising and falling or wavelike pattern
cause to fluctuate or move in a wavelike pattern