prostration vs sickness

prostration and sickness both are nouns.

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

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

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

Other hypernyms of prostration include illness, malady, unwellness.

prostration (noun)	sickness (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	the state that precedes vomiting
an abrupt failure of function or complete physical exhaustion	defectiveness or unsoundness