katamorphism vs metamorphism

katamorphism and metamorphism both are nouns.

Word	Noun	Adjective	Verb	Adverb
katamorphism	Yes	No	No	No
metamorphism	Yes	No	No	No

As nouns, metamorphism is a hypernym of katamorphism; that is, metamorphism is a word with a broader meaning than katamorphism:

katamorphism: metamorphism that occurs at or near the earth's surface; breaks down complex minerals into simpler ones
metamorphism: change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances

katamorphism (noun)	metamorphism (noun)
metamorphism that occurs at or near the earth's surface; breaks down complex minerals into simpler ones	change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances