anoxia vs hypoxia

anoxia and hypoxia both are nouns.

Word	Noun	Adjective	Verb	Adverb
anoxia	Yes	No	No	No
hypoxia	Yes	No	No	No

As nouns, hypoxia is a hypernym of anoxia; that is, hypoxia is a word with a broader meaning than anoxia:

anoxia: severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues
hypoxia: oxygen deficiency causing a very strong drive to correct the deficiency

anoxia (noun)	hypoxia (noun)
severe hypoxia; absence of oxygen in inspired gases or in arterial blood or in the tissues	oxygen deficiency causing a very strong drive to correct the deficiency