roulade vs melody

roulade and melody both are nouns.

Word	Noun	Adjective	Verb	Adverb
roulade	Yes	No	No	No
melody	Yes	No	No	No

As nouns, melody is a hypernym of roulade; that is, melody is a word with a broader meaning than roulade:

Other hypernyms of roulade include air, line, melodic line, melodic phrase, strain, tune.

roulade (noun)	melody (noun)
(music) an elaborate run of several notes sung to one syllable	the perception of pleasant arrangements of musical notes
a dish consisting of a slice of meat that is rolled around a filling and cooked	a succession of notes forming a distinctive sequence