Mistaken for Mistake. "You are mistaken." For whom? Say, You mistake.
Monarch for King, Emperor, or Sovereign. Not only hyperbolical, but inaccurate. There is not a monarch in Christendom.
Moneyed for Wealthy. "The moneyed men of New York." One might as sensibly say, "The cattled men of Texas," or, "The lobstered men of the fish market."
Most for Almost. "The apples are most all gone." "The returning travelers were most home."
Moved for Removed. "The family has moved to another house." "The Joneses were moving."
Mutual. By this word we express a reciprocal relation. It implies exchange, a giving and taking, not a mere possessing in common. There can be a mutual affection, or a mutual hatred, but not a mutual friend, nor a mutual horse.
Name for Title and Name. "His name was Mr. Smith." Surely no babe was ever christened Mister.
Necessaries for Means. "Bread and meat are necessaries of life." Not so; they are the mere means, for one can, and many do, live comfortably without them. Food and drink are necessaries of life, but particular kinds of food and drink are not.
Necessities for Necessaries. "Necessities of life are those things without which we cannot live."
Née. Feminine of né, born. "Mrs. Jones, née Lucy Smith." She could hardly have been christened before her birth. If you must use the French word say, née Smith.