etude (n.)

• adaptation
• arrangement
• article
• causerie
• composition
• descant
• discourse
• discussion
• disquisition
• dissertation
• essay
• examination
• excursus
• exercise
• exposition
• feature
• harmonization
• homily
• invention
• lucubration
• memoir
• monograph
• morceau
• nocturne
• note
• opus
• orchestration
• outline
• paper
• paragraph
• piece
• production
• prolegomenon
• score
• screed
• sketch
• sonata
• sonatina
• study
• survey
• theme
• thesis
• tract
• treatise
• treatment
• trio
• variation
• work