feverishness vs fever

feverishness and fever both are nouns.

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

As nouns, feverishness and fever are synonyms defined as:

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

Other synonyms of feverishness include febricity, febrility, pyrexia.

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