slow down vs change state

slow down and change state both are verbs.

Word	Noun	Adjective	Verb	Adverb
slow down	No	No	Yes	No
change state	No	No	Yes	No

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

Other hypernyms of slow down include turn.

slow down (verb)	change state (verb)
become less tense, rest, or take one's ease	undergo a transformation or a change of position or action
lose velocity; move more slowly
become slow or slower
reduce the speed of
cause to proceed more slowly