aerialist vs ropedancer

aerialist and ropedancer both are nouns.

Word	Noun	Adjective	Verb	Adverb
aerialist	Yes	No	No	No
ropedancer	Yes	No	No	No

As nouns, ropedancer is a hyponym of aerialist; that is, ropedancer is a word with a more specific, narrower meaning than aerialist:

aerialist: an acrobat who performs in the air (as on a rope or trapeze)
ropedancer: an acrobat who performs on a rope stretched at some height above the ground

Other hyponyms of aerialist include ropewalker.

aerialist (noun)	ropedancer (noun)
an acrobat who performs in the air (as on a rope or trapeze)	an acrobat who performs on a rope stretched at some height above the ground