The (polite) Four Letter Word Game

fear

fern

firn

http://www.oxforddictionaries.com/definition/english/firn

rink

rank

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bran

drab

barn

burn

ruby

byre

lyre

reel

reef

rife

file

pile :hankey:

ilea

alee

www.finedictionary.com/alee.html

kale