Etude
particle
piece, portion, section, bit
Adverse Possession
it is called singing class
pistol, firearm, shooter, handgun
Another word is master piece.
A piece
An essay is a piece of writing.
fragment
particle
a song
Aria
slab
band
Book It
Playlet is a short dramatic piece.
A morsel is just a tiny piece or a fragment. An old French word.