rondeau vs rondo

rondeau and rondo both are nouns.

Word	Noun	Adjective	Verb	Adverb
rondeau	Yes	No	No	No
rondo	Yes	No	No	No

As nouns, rondeau and rondo are synonyms defined as:

rondeau and rondo: a musical form that is often the last movement of a sonata

rondeau (noun)	rondo (noun)
a French verse form of 10 or 13 lines running on two rhymes; the opening phrase is repeated as the refrain of the second and third stanzas	a musical form that is often the last movement of a sonata
a musical form that is often the last movement of a sonata