1.  manna from heaven(n = noun.food) manna, miraculous food - (Old Testament) food that God gave the Israelites during the Exodus;
is a kind of food, nutrient

2.  manna from heaven(n = noun.event) bonanza, boom, bunce, godsend, gold rush, gravy, windfall - a sudden happening that brings good fortune (as a sudden opportunity to make money); "the demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line"
is a kind of happening, natural event, occurrence, occurrent

heaven, manna, manna ash, manna croup, manna grass, manna gum, manna lichen, seventh heaven, tree of heaven, vault of heaven