Cur and Half blood

Cur noun - A person who shows a shameful lack of courage in the face of danger.

Half blood and cur are semantically related In some cases you can replace phrase "Half blood" with "Cur", this terms are similar.

Half blood noun - One of siblings who have only one parent in common.

Cur and half blood are semantically related in sibling sharing one parent topic. You can use "Cur" instead a noun phrase "Half blood".