poem vs rondel

poem and rondel both are nouns.

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

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

poem: a composition written in metrical feet forming rhythmical lines
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

poem (noun)	rondel (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