malady vs sickness

malady and sickness both are nouns.

Word	Noun	Adjective	Verb	Adverb
malady	Yes	No	No	No
sickness	Yes	No	No	No

As nouns, malady and sickness are synonyms defined as:

malady and sickness: impairment of normal physiological function affecting part or all of an organism

Other synonyms of malady include illness, unwellness.

malady (noun)	sickness (noun)
impairment of normal physiological function affecting part or all of an organism	impairment of normal physiological function affecting part or all of an organism
any unwholesome or desperate condition	the state that precedes vomiting
	defectiveness or unsoundness