tense vs change state

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

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

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

Other hypernyms of tense include turn.

tense (noun)	change state (noun)
a grammatical category of verbs used to express distinctions of time

tense (adjective)	change state (adjective)
taut or rigid; stretched tight
pronounced with relatively tense tongue muscles (e.g., the vowel sound in `beat')
in or of a state of physical or nervous tension

tense (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
increase the tension on
become stretched or tense or taut