malady vs illness

malady and illness both are nouns.

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

As nouns, malady and illness are synonyms defined as:

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

Other synonyms of malady include sickness, unwellness.

malady (noun)	illness (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