Foster father and Foster-parent

Foster father noun - A man who is a foster parent.

Foster-parent and foster father are semantically related. In some cases you can use "Foster-parent" instead a noun phrase "Foster father".

Foster-parent noun - A person who acts as parent and guardian for a child in place of the child's natural parents but without legally adopting the child.

Foster father and foster-parent are semantically related. Sometimes you can replace phrase "Foster father" with "Foster-parent", this phrases are similar.