The same change can be made to each of the word below to form longer words.  What is the change and what are the new words?

CIRCUS

SUBTLE

GRAVY

WHEN

VISOR

 

HINTS:

1. BRAIN could be added to the list.

2. Added letters

 

Answers:

 

Each word becomes a new one by inserting the letters IT somewhere within the word:

 

CIRCUS - CIRCUITS

SUBTLE - SUBTITLE

GRAVY - GRAVITY

WHEN - WHITEN

VISOR - VISITOR

(BRAIN - BRITAIN) 

 

Credit:

Brad Lively