Synonyms for Budgerigar (same or very similar meaning)
WordNet sense 1 (small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors):
budgie, lovebird, budgereegah, budgerygah, grass parakeet, Melopsittacus undulatus, shell parakeetFrom the ODE community, based on WordNetadd/edit