The blanks in each clue below can be filled in with words which have something in common.

1. _ _ _ ION
2. _ _ _ _ ER
3. _ _ _ _ LISH
4. _ _ _ _ CULE
5. B _ _ _ _ _
6. RESI _ _ _ _  ION

Answers:

1. RATion
2. MOTHer
3. TICKlish
4. MOLEcule
5. bLOUSE
6. resiGNATion

Credit: NY Times Crossword - Jan. 13, 1991
Kenneth Haxton
EXTERMINATE THE PESTS!