foster-child vs fosterling

foster-child and fosterling both are nouns.

Word	Noun	Adjective	Verb	Adverb
foster-child	Yes	No	No	No
fosterling	Yes	No	No	No

As nouns, foster-child and fosterling are synonyms defined as:

Other synonyms of foster-child include foster child.

foster-child (noun)	fosterling (noun)
a child who is raised by foster parents	a child who is raised by foster parents