What is Common?

Last Problem:

What is the fewest number of colors you can use to color a map of the U.S. without using any of the same colors on connecting states – no border lines have the same color on both sides?

Answer:

The answer is “4” – you can have virtually any map, real or imagined, where no borders will touch a common color, using only 4 colors.

Today’s Problem:

What is the common link among these words:

threshold, taciturn, signature, redress, misspelling, lambaste, hockey, decoration