iodination vs chemical change

iodination and chemical change both are nouns.

Word	Noun	Adjective	Verb	Adverb
iodination	Yes	No	No	No
chemical change	Yes	No	No	No

As nouns, chemical change is a hypernym of iodination; that is, chemical change is a word with a broader meaning than iodination:

iodination: the substitution or addition of iodine atoms in organic compounds
chemical change: (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

Other hypernyms of iodination include chemical action, chemical process.

iodination (noun)	chemical change (noun)
the substitution or addition of iodine atoms in organic compounds	(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved