different between fairgrounds vs amusementparks

English

From fair +? grounds.

fairgrounds (plural fairgrounds)

Alternative spelling of fairground; the grounds where a fair is held.
At other times of the year, the county fairgrounds are used for a variety of events, such as revival meetings and high-school graduations.
If the town doesn't have a nearby fairgrounds, then any sizeable empty field will do for a carnival.

This variant is often chosen when the site is for a recurring fair, as opposed to a happenstance itinerant one
While this is plural, the use is sometimes treated as singular.

fairgrounds

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