Question

before & after
color code the words based on their prefix.
if the prefix means before green - colored pencil icon
if the prefix means after blue - colored pencil icon
prehistoric
forefather
postscript
postbellum
anteroom
forecast

Explanation:

The prefix "pre -" in "prehistoric", "fore -" in "forefather" and "forecast", and "ante -" in "anteroom" mean before. The prefix "post -" in "postscript" and "postbellum" means after.

Answer:

Color "prehistoric", "forefather", "forecast", "anteroom" with the color for "BEFORE" prefix. Color "postscript", "postbellum" with the color for "AFTER" prefix.