Synonyms for Ambrosia (same or very similar meaning)
WordNet sense 1 (a mixture of nectar and pollen prepared by worker bees and fed to larvae):
beebread
WordNet sense 2 (any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma):
ragweed, bitterweed
WordNet sense 3 ((classical mythology) the food and drink of the gods; mortals who ate it became immortal):
nectar
From the ODE community, based on WordNet
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