We don't have synonyms for bellwork yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are beadwork, bellwort and bullwort.
(n) :
Alternative form of bell work. [A small quantity of schoolwork, with instructions posted or announced at or before the start of class, so that students commence working on it as soon as the class period has begun.]
(n) :
Alternative form of bell work. [A small quantity of schoolwork, with instructions posted or announced at or before the start of class, so that students commence working on it as soon as the class period has begun.]