ill vs illness

ill and illness both are nouns.

ill is an adjective but illness is not an adjective.

ill is an adverb but illness is not an adverb.

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

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

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

ill (adverb)	illness (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 ill and illness

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