Margin
Part of speech: noun
Definition: The edge of the paper that remains blank. The yield or profit; the selling price minus the cost of production. A permissible difference; allowing some freedom to move within limits, as a margin of error.
Part of speech: verb
Definition: To add a margin to.
Example sentence: I support the death penalty. But I also think there has to be no margin for error.
Allowance
Part of speech: noun
Definition: The act of allowing, granting, conceding, or admitting; authorization; permission; sanction; tolerance.Acknowledgment.That which is allowed; a share or portion allotted or granted; a sum granted as a reimbursement, a bounty, or as appropriate for any purpose; a stated quantity, as of food or drink; hence, a limited quantity of meat and drink, when provisions fall short.Abatement; deduction; the taking into account of mitigating circumstances; as, to make allowance for the inexperience of youth.A customary deduction from the gross weight of goods, different in different countries, such as tare and tret.A child's allowance; pocket money.
Example sentence: What is important for kids to learn is that no matter how much money they have, earn, win, or inherit, they need to know how to spend it, how to save it, and how to give it to others in need. This is what handling money is about, and this is why we give kids an allowance.