Domino and Six-spot

Domino noun - A small rectangular block used in playing the game of dominoes; the face of each block has two equal areas that can bear 0 to 6 dots.

Six-spot and domino are semantically related. In some cases you can replace phrase "Six-spot" with "Domino", this terms are similar.

Six-spot noun - A playing card or domino or die whose upward face shows six pips.

Domino and six-spot are semantically related. You can use "Domino" instead a noun phrase "Six-spot".