The term 'nectar eater' can be summarized by the crossword solution 'bee, ' which is a three-letter word. Bees are a type of insect that feed on nectar, a sugary liquid produced by flowers. They use their long tongues to extract the nectar from the flower and store it in their honey stomachs. Bees are essential pollinators for many plants, and they produce honey as a byproduct of their nectar-eating activities.