1. What two things do the following words have in common?

TIDE
TECH
CLASS
PROFILE

2. What do the following words have in common?

PIT
TUB
GAL
CHIN
PARK

HINT:
2. The same letter, placed in the same position, will change each word into a new one.

Answers:

1. Each word can be preceded by both HIGH and LOW.

2. Each word can be followed by A.

PITA / TUBA / GALA / CHINA / PARKA 

Credit: Chicago Tribune Crossword
Willy A. Wiseman - FOLLOWED BY A ..............