defervescence vs abatement

defervescence and abatement both are nouns.

Word	Noun	Adjective	Verb	Adverb
defervescence	Yes	No	No	No
abatement	Yes	No	No	No

As nouns, abatement is a hypernym of defervescence; that is, abatement is a word with a broader meaning than defervescence:

defervescence: abatement of a fever as indicated by a reduction in body temperature
abatement: an interruption in the intensity or amount of something

Other hypernyms of defervescence include hiatus, reprieve, respite, suspension.

defervescence (noun)	abatement (noun)
abatement of a fever as indicated by a reduction in body temperature	the act of abating
	an interruption in the intensity or amount of something