Crescent and Oxbow

Crescent noun - Any shape resembling the curved shape of the moon in its first or last quarters.

Oxbow and crescent are semantically related. In some cases you can use "Oxbow" instead a noun "Crescent".

Oxbow noun - A wooden framework bent in the shape of a U; its upper ends are attached to the horizontal yoke and the loop goes around the neck of an ox.

Crescent and oxbow are semantically related. Sometimes you can use "Crescent" instead a noun "Oxbow".