minuscule

noun 0.580

opusculum

noun 0.564

booklet

noun 0.550

chapbook

noun 0.538

osculum

noun 0.532

offprint

noun 0.530

opus

noun 0.522

minor piece

noun 0.512

obolus

noun 0.511

ovule

noun 0.509

pamphlet

noun 0.506

operetta

noun 0.506

piccolo

noun 0.500