4位单词,有2个字母是一样的

area
cool
door
moon
bill
good
food
feel
feed
book
lass
noon
boss
boom
call
sell
bell
feel
look
tell
cook
wood
door
foot
room
loom
took

soon
butt
dead
deer
knee
beer
tall
were
ball
need
meet
agee
akee
bree
gree
epee
pree
skee
tree
twee
mzee
beef
beer
deep
keen
reef
seer
reed
peer
doll
dull
dill
dell
wall
will
roll
kill
mill