cryogeny vs physics

cryogeny and physics both are nouns.

Word	Noun	Adjective	Verb	Adverb
cryogeny	Yes	No	No	No
physics	Yes	No	No	No

As nouns, physics is a hypernym of cryogeny; that is, physics is a word with a broader meaning than cryogeny:

cryogeny: the branch of physics that studies the phenomena that occur at very low temperatures
physics: the science of matter and energy and their interactions

Other hypernyms of cryogeny include natural philosophy.

cryogeny (noun)	physics (noun)
the branch of physics that studies the phenomena that occur at very low temperatures	the science of matter and energy and their interactions
	the physical properties, phenomena, and laws of something