ERASERS
NY Times Crossword
December 12, 2013
David Steinberg

The same change can be made to each of the words and the phrase below to change them into new ones.

1. MAINE
2. CONES
3. GAMMA
4. M AND MS

HINTS:
#1: The title is a hint if you parse it out.
#2: The change involves the same two letters.

Answers:

The title ERASERS can be parsed out as ERASE R's.
Adding two R's to each word or phrase will change it into a new one:

1. MAINE - MARINER
2. CONES - CORNERS
3. GAMMA - GRAMMAR
4. M AND MS - MR. AND MRS.