ill vs laid low

ill is a noun but laid low is not a noun.

Word	Noun	Adjective	Verb	Adverb
ill	Yes	Yes	No	Yes
laid low	No	Yes	No	No

ill (noun)	laid low (noun)
an often persistent bodily disorder or disease; a cause for complaining

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

ill (adverb)	laid low (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