circus tent vs round top

circus tent and round top both are nouns.

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

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

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

Other synonyms of circus tent include big top, top.

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