Four letter words--Change 0 to 1 letter to make a new word

Turk :tr:

murk :blowfish:

mark :pen:

dark :black_heart:

bark :dog:

lark :hatching_chick:

lack :anguished:

pack :male_detective:

hack :computer:

hock :dizzy:

mock :stuck_out_tongue_winking_eye:

sock :socks:

rock :mountain_snow:

lock :mage:

cool :smirk:

fool :crazy_face:

foil :anguished:

toil :sweat:

coil :snake:

lick :stuck_out_tongue: