chorus vs tra-la-la

chorus and tra-la-la both are nouns.

Word	Noun	Adjective	Verb	Adverb
chorus	Yes	No	Yes	No
tra-la-la	Yes	No	No	No

As nouns, tra-la-la is a hyponym of chorus; that is, tra-la-la is a word with a more specific, narrower meaning than chorus:

Other hyponyms of chorus include tra-la.

chorus (noun)	tra-la-la (noun)
the part of a song where a soloist is joined by a group of singers	a set of nonsensical syllables used while humming a refrain
any utterance produced simultaneously by a group
a group of people assembled to sing together
a body of dancers or singers who perform together
a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play

chorus (verb)	tra-la-la (verb)
utter in unison
sing in a choir