poem vs sotadic verse

poem and sotadic verse both are nouns.

Word	Noun	Adjective	Verb	Adverb
poem	Yes	No	No	No
sotadic verse	Yes	No	No	No

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

poem: a composition written in metrical feet forming rhythmical lines
sotadic verse: palindromic verse, named after Satodes, an Ancient Greek poet.

poem (noun)	sotadic verse (noun)
a composition written in metrical feet forming rhythmical lines	palindromic verse, named after Satodes, an Ancient Greek poet.