Other hyponyms of opus include
morceau,
sheet music,
arrangement,
musical arrangement,
realisation,
realization,
intermezzo,
introit,
solo,
duet,
duette,
duo,
trio,
quartet,
quartette,
quintet,
quintette,
sestet,
sextet,
sextette,
septet,
septette,
octet,
octette,
bagatelle,
divertimento,
serenade,
canon,
etude,
idyl,
idyll,
pastoral,
pastorale,
sonata,
toccata,
fantasia,
passage,
movement,
larghetto,
suite,
symphonic poem,
tone poem,
medley,
pastiche,
potpourri,
nocturne,
notturno,
song,
vocal,
study,
capriccio,
motet,
program music,
programme music,
incidental music,
csardas,
czardas.