Lustrum and Pentacle

Lustrum noun - A ceremonial purification of the Roman population every five years following the census.

Pentacle and lustrum are semantically related in five of something topic. In some cases you can use "Pentacle" instead a noun "Lustrum".

Pentacle noun - A star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon.

Lustrum and pentacle are semantically related in five of something topic. You can use "Lustrum" instead a noun "Pentacle".