curve ball vs breaking ball

curve ball and breaking ball both are nouns.

Word	Noun	Adjective	Verb	Adverb
curve ball	Yes	No	No	No
breaking ball	Yes	No	No	No

As nouns, curve ball and breaking ball are synonyms defined as:

curve ball and breaking ball: a pitch of a baseball that is thrown with spin so that its path curves as it approaches the batter

Other synonyms of curve ball include bender, curve.

curve ball (noun)	breaking ball (noun)
a pitch of a baseball that is thrown with spin so that its path curves as it approaches the batter	a pitch of a baseball that is thrown with spin so that its path curves as it approaches the batter