The word "Fosterling" means a person who has been reared or fostered in a certain family or environment. There are several synonyms available for the word that can be used to convey the same meaning to the readers. Some of these synonyms include adopted child, ward, protege, disciple, foster child, fosterling, beneficiary, and grantee. All of these words can be used interchangeably with fosterling, depending on the context and tone of the text. It is always better to use synonyms in your writing to avoid repetition and to add some variety to your language. So, these synonyms can be very useful for writers who want to add diversity to their writing.