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PAC Acronym for political action committee. Acceptable on first reference but spell out early in the article or document. Lowercase the spelled out form unless its part of a complete name. Legal but not necessarily acceptable are Super PACs, which can raise and spend unlimited amounts of money, supposedly because the corporations and unions that send them unlimited amounts of money are people with free-speech rights, belly-button lint and acid reflux (or something like that), says the U.S. Supreme Court.
pair A pair is a group of two or something with two similar parts. The singular noun takes a singular verb: The pair of scissors is in the drawer. His pair of black dress shoes is in the closet. The preferred plural is pairs: She took three pairs of pants on the trip. Also, using a pair of when writing about one set of twins, scissors, shoes and so on is often redundant. Simplify. Try dropping a pair of.
paradigm Obscure, pompous jargon. Unless you're trying to impress and confuse readers simultaneously, use simpler pattern, model or example. Instead of a paradigm shift, try a new idea for doing something or a new way of viewing something.
peaceable, peaceful Sometimes confused and often ignored, unfortunately. Use peaceable to describe a person or nation that doesn't like to argue or cause fights. Use peaceful to describe a person, place, relationship or situation that is calm, tranquil, quiet, or not at war or in violent conflict.