Half-moon and Planetoid

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

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

Planetoid noun - Any of numerous small celestial bodies that move around the sun.

Half-moon and planetoid are semantically related. You can use "Half-moon" instead a noun "Planetoid".