cataplasia vs retrogression

cataplasia and retrogression both are nouns.

Word	Noun	Adjective	Verb	Adverb
cataplasia	Yes	No	No	No
retrogression	Yes	No	No	No

As nouns, retrogression is a hypernym of cataplasia; that is, retrogression is a word with a broader meaning than cataplasia:

cataplasia: (biology) degenerative reversion of cells or tissue to a less differentiated or more primitive form
retrogression: passing from a more complex to a simpler biological form

Other hypernyms of cataplasia include degeneration.

cataplasia (noun)	retrogression (noun)
(biology) degenerative reversion of cells or tissue to a less differentiated or more primitive form	returning to a former state
	passing from a more complex to a simpler biological form