Spelling Rules -- Making Noun Plurals - Page 9

Rule 23: When the first element of a compound is a possessive, simply pluralize the final element. See below.

collector's item -- collector's items traveler's check -- traveler's checks rabbit's foot -- rabbit's feet proofreaders' mark -- proofreaders' mark s rogues' gallery -- rogues' galleries witches' brew -- witches' brews finder's fee -- finder's fees visitor's permit -- visitor's permits

Rule 24: The abbreviations of many customary units of weights and measure, however, are the same in both the singular and plural. See below.

1. oz -- ounce or ounces 2. deg -- degree or degrees 3. bbl -- barrel or barrels 4. ft -- foot or feet 5. in -- inch or inches 6. mi -- mile or miles 7. km -- kilometer or kilometers 8. ml -- milliliter or milliliters 9. cg -- centigram or centigrams 10. kg -- kilogram or kilograms 11. kl -- kiloliter or kiloliters 12. kW -- kilowatt or kilowatts 13. kt -- knot or knots 14. pt -- pint or pints 15. qt -- quarts or quarts 16. tsp -- teaspoon or teaspoons 17. yd -- yard or yards 18. tbsp -- tablespoon or tablespoons

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