tense up vs change state

tense up and change state both are verbs.

Word	Noun	Adjective	Verb	Adverb
tense up	No	No	Yes	No
change state	No	No	Yes	No

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

Other hypernyms of tense up include turn.

tense up (verb)	change state (verb)
cause to be tense and uneasy or nervous or anxious	undergo a transformation or a change of position or action
become tense, nervous, or uneasy