pyrexia vs feverishness

pyrexia and feverishness both are nouns.

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

As nouns, pyrexia and feverishness are synonyms defined as:

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

Other synonyms of pyrexia include febricity, febrility, fever.

pyrexia (noun)	feverishness (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.