Chords and Half-moon

Half-moon and chords are semantically related. in arched topic. In some cases you can use "Half-moon" instead a noun "Chords".

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

Chords and half-moon are semantically related. Sometimes you can replace term "Chords" with "Half-moon", this terms are similar.