round top vs circus tent

round top and circus tent both are nouns.

Word	Noun	Adjective	Verb	Adverb
round top	Yes	No	No	No
circus tent	Yes	No	No	No

As nouns, round top and circus tent are synonyms defined as:

round top and circus tent: a canvas tent to house the audience at a circus performance

Other synonyms of round top include big top, top.

round top (noun)	circus tent (noun)
a canvas tent to house the audience at a circus performance	a canvas tent to house the audience at a circus performance