feverishness vs pyrexia

feverishness and pyrexia both are nouns.

Word	Noun	Adjective	Verb	Adverb
feverishness	Yes	No	No	No
pyrexia	Yes	No	No	No

As nouns, feverishness and pyrexia are synonyms defined as:

feverishness and pyrexia: a rise in the temperature of the body; frequently a symptom of infection

Other synonyms of feverishness include febricity, febrility, fever.

feverishness (noun)	pyrexia (noun)
a rise in the temperature of the body; frequently a symptom of infection	a rise in the temperature of the body; frequently a symptom of infection
A state of wildly excited activity or emotion.