ballad vs verse form

ballad and verse form both are nouns.

Word	Noun	Adjective	Verb	Adverb
ballad	Yes	No	No	No
verse form	Yes	No	No	No

As nouns, verse form is a hypernym of ballad; that is, verse form is a word with a broader meaning than ballad:

Other hypernyms of ballad include poem.

ballad (noun)	verse form (noun)
a narrative poem of popular origin	a composition written in metrical feet forming rhythmical lines
a narrative song with a recurrent refrain