papery
rapper
raptor
parrot
carrot
cannot
toucan
outcry
courts
skorts
skirts
strict
Christ
heists
You changed three letters.
Christ still in play.
Christ → heists
Both words contain the letters h, i, s, and t. Only two letters have been changed.
In play:
thesis
themes
(Sorry, my bad! Missed the “h”. 
)
honest
stones