Synonyms for Corpuscle (same or very similar meaning)
WordNet sense 1 ((nontechnical usage) a tiny piece of anything):
atom, molecule, mote, particle, speckWordNet sense 2 (either of two types of cells (erythrocytes and leukocytes) and sometimes including platelets):
blood cell, blood corpuscleFrom the ODE community, based on WordNetadd/edit