Half-moon and Oxbow

Half-moon noun - The time at which the Moon is at first or last quarter when half its face is illuminated.

Oxbow and half-moon are semantically related. In some cases you can use "Oxbow" instead a noun phrase "Half-moon".

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.

Half-moon and oxbow are semantically related. Sometimes you can use "Half-moon" instead a noun "Oxbow".