NY Times Crossword
February 23, 2005
Lee Glickstein

What do the following three-letter words have in common?

1. FLU
2. CUP
3. RIG
4. RAP
5. SAP
6. HUM

Answer:

Each word becomes a new one with the addition of ID at the end:

1. FLUID
2. CUPID
3. RIGID
4. RAPID
5. SAPID
6. HUMID