Synonyms for Melopsittacus Undulatus (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):
budgerigar, budgie, lovebird, budgereegah, budgerygah, grass parakeet, shell parakeetFrom the ODE community, based on WordNetadd/edit