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(A dozen = 12): I'd like to buy a dozen eggs. When dozen isn't preceded by a numeral (like three) or by a we use the plural form: There were dozens of eggs
Baggage, another word for luggage, can't be used in the plural either: The baggage is ready for the train.
The plural form works means a factory or the writings of an author: The works of Shakespeare are many. I visited the steel works.
Furniture is a singular noun and always takes a singular verb and pronoun. A piece of furniture means one thing only.