Illy, Ill

Do not use illy for ill. The former is becoming obsolete, and the
latter, as an adverb, is taking its place. Say "An ill-ventilated
room," not "an illy-ventilated room."

Implicit

This word means tacitly understood, resting on the word or authority
of another. It should not be used in the sense of unbounded,
unlimited.

Individual

This word should not be used broadly in the sense of a person, but
should always convey some thought of a single thing or person, as
opposed to many.

Journal

As this word is from the French, jour, day, it should not be applied
to a monthly or quarterly magazine.

Know as

"I do not know as I can see you to-day." Say know that.
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