rondeau vs rondel

rondeau and rondel both are nouns.

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

As nouns, rondeau and rondel are synonyms defined as:

rondeau and rondel: 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

rondeau (noun)	rondel (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 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