chelation vs chemical change

chelation and chemical change both are nouns.

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

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

chelation: the process of forming a ring by forming one or more hydrogen bonds
chemical change: (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

Other hypernyms of chelation include chemical action, chemical process.

chelation (noun)	chemical change (noun)
the process of forming a ring by forming one or more hydrogen bonds	(chemistry) any process determined by the atomic and molecular composition and structure of the substances involved
(medicine) the process of removing a heavy metal from the bloodstream by means of a chelate as in treating lead or mercury poisoning