carousel vs merry-go-round

carousel and merry-go-round both are nouns.

Word	Noun	Adjective	Verb	Adverb
carousel	Yes	No	No	No
merry-go-round	Yes	No	No	No

As nouns, carousel and merry-go-round are synonyms defined as:

carousel and merry-go-round: a large, rotating machine with seats for children to ride on for amusement

Other synonyms of carousel include carrousel, roundabout, whirligig.

carousel (noun)	merry-go-round (noun)
a large, rotating machine with seats for children to ride on for amusement	a large, rotating machine with seats for children to ride on for amusement
a conveyer belt that carries luggage to be claimed by air travelers	a never-ending cycle of activities and events (especially when they seem to have little purpose)