WordNet sense 1 (a musical work that has been created):

opus, piece, musical composition, piece of music

WordNet sense 2 (art and technique of printing with movable type):

typography

WordNet sense 3 (an essay (especially one written as an assignment)):

paper, report, theme, report

WordNet sense 4 (the spatial property resulting from the arrangement of parts in relation to each other and to the whole):

composing

WordNet sense 5 (the way in which someone or something is composed):

constitution, makeup

WordNet sense 6 (the act of creating written works):

authorship, writing, penning