Memo and Squib

Memo noun - A message on paper from one person or group to another.

Squib and memo are semantically related In some cases you can use "Squib" instead a noun "Memo".

Squib noun - Firework consisting of a tube filled with powder (as a broken firecracker) that burns with a fizzing noise.

Memo and squib are semantically related in announcement topic. Sometimes you can use "Memo" instead a noun "Squib".