illness vs ill

illness and ill both are nouns.

illness is not an adjective while ill is an adjective.

illness is not an adverb while ill is an adverb.

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

illness (noun)	ill (noun)
impairment of normal physiological function affecting part or all of an organism	an often persistent bodily disorder or disease; a cause for complaining

illness (adjective)	ill (adjective)
	affected by an impairment of normal physical or mental function
	distressing
	resulting in suffering or adversity
	indicating hostility or enmity
	presaging ill fortune

illness (adverb)	ill (adverb)
	(`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well
	with difficulty or inconvenience; scarcely or hardly
	unfavorably or with disapproval

Difference between illness and ill

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