The Y-ending words below share an unusual quality. Can you determine what it is?

1. FILLY
2. PINKY
3. FAIRY
4. COPY
5. HOOKY
6. BELLY

Answer:

If you drop the Y in each word, the remaining word has nothing to do with the original word.

Credits:
#1-4: Tucker Smith
          DAMAGED GOODIES

Note: See also: FALSE PLURALS I and II - posted 9/18/15 and 7/10/17