This is the 12396th most frequent Russian word.
карусели
"Карусели" means "merry-go-rounds" or "carousels."
Here, 'каруселях' (plural form of 'карусель' in the prepositional case) refers to the amusement park rides.
Дети весело катаются на каруселях в парке.
The children are riding merrily on the carousels in the park.
In this sentence, 'карусели' (plural form of 'карусель' in the nominative case) denotes multiple carousel rides explicitly.
На ярмарке установили новые карусели и аттракционы.
New carousels and attractions have been installed at the fair.
Here, 'карусели' (plural form of 'карусель' in the accusative case) describes carousel rides in a visual context.