What do the following words have in common?

TOP
SON
LOG
ANT
MAN

HINT:
The same two letters will change each word into a new one.

Answers:

Each word can be followed by IC to make a new word:

TOPIC
SONIC
LOGIC
ANTIC
MANIC

Credit: NY Times Crossword
Dana Delany and Matt Ginsberg
Sept. 4, 2011 - THAT'S DISGUSTING!