ossify vs change state

ossify and change state both are verbs.

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

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

Other hypernyms of ossify include turn.

ossify (verb)	change state (verb)
become bony	undergo a transformation or a change of position or action
cause to become hard and bony
make rigid and set into a conventional pattern