poem vs rondeau

poem and rondeau both are nouns.

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

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

poem: a composition written in metrical feet forming rhythmical lines
rondeau: 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

poem (noun)	rondeau (noun)
a composition written in metrical feet forming rhythmical lines	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