ill vs bad

ill and bad both are nouns.

ill and bad both are adjectives.

ill and bad both are adverbs.

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

ill (noun)	bad (noun)
an often persistent bodily disorder or disease; a cause for complaining	that which is below standard or expectations as of ethics or decency

ill (adjective)	bad (adjective)
affected by an impairment of normal physical or mental function	having undesirable or negative qualities
distressing	feeling or expressing regret or sorrow or a sense of loss over something done or undone
resulting in suffering or adversity	reproduced fraudulently
indicating hostility or enmity	characterized by wickedness or immorality
presaging ill fortune	capable of harming
	below average in quality or performance
	serious or severe
	not capable of being collected
	not working properly
	nonstandard
	(of foodstuffs) not in an edible or usable condition
	feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad')
	physically unsound or diseased
	not financially safe or secure

ill (adverb)	bad (adverb)
(`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well	very much; strongly
with difficulty or inconvenience; scarcely or hardly	with great intensity (`bad' is a nonstandard variant for `badly')
unfavorably or with disapproval

Difference between ill and bad

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