oxidation vs chemical reaction

oxidation and chemical reaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
oxidation	Yes	No	No	No
chemical reaction	Yes	No	No	No

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

oxidation: the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction
chemical reaction: (chemistry) a process in which one or more substances are changed into others

Other hypernyms of oxidation include reaction.

oxidation (noun)	chemical reaction (noun)
the process of oxidizing; the addition of oxygen to a compound with a loss of electrons; always occurs accompanied by reduction	(chemistry) a process in which one or more substances are changed into others