Abandoned child refers to a child who is left out in the open, searching for someone to take care of them. There are several synonyms for this phrase, including orphan, foundling, waif, castaway, stray, and deserted. An orphan is a child whose parents are dead or have abandoned them. A foundling is an infant who has been abandoned and found by others. A waif is a child who has been left homeless and without family. Meanwhile, a castaway is a person abandoned in a strange place, while a stray refers to an abandoned animal. Lastly, deserted denotes a place or person abandoned by others. All these synonyms relate to the idea of a child left alone without care or a family to call their own.