prostration vs illness

prostration and illness both are nouns.

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

As nouns, illness is a hypernym of prostration; that is, illness is a word with a broader meaning than prostration:

prostration: an abrupt failure of function or complete physical exhaustion
illness: impairment of normal physiological function affecting part or all of an organism

Other hypernyms of prostration include malady, sickness, unwellness.

prostration (noun)	illness (noun)
the act of assuming a prostrate position	impairment of normal physiological function affecting part or all of an organism
abject submission; the emotional equivalent of prostrating your body
an abrupt failure of function or complete physical exhaustion