The same phonetic change can be made to each of the words below to create new words. Can you determine what it is?

CHAIR
MISTER
UNTIED
PARROT
SUMMER

HINT:
The change occurs at the ends of the words.

Answer:

By adding the long e sound to the end of each word, a new word is formed phonetically:

CHAIR - CHERRY
MISTER - MYSTERY
UNTIED - UNTIDY
PARROT - PARITY
SUMMER - SUMMARY

Credit:
NPR Weekend Edition Sunday Puzzle
February 28, 2010
Will Shortz