Synonyms for Subdivision (same or very similar meaning)
WordNet sense 1 (an administrative division of some larger or more complex organization):
arm, branchWordNet sense 2 (a self-contained part of a larger composition (written or musical)):
sectionWordNet sense 3 (a section of a section; a part of a part; i.e., a part of something already divided):
subsectionFrom the ODE community, based on WordNetadd/edit