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

coil.

cold :ice_cube:

bold :japanese_ogre:

dolt.

toad.

dart :dart:

raft.

rate.

tear :sob:

tsar.

star.

rasp.

spar :boxing_glove:

pray.

tray.

tart.

trot.

tote.

note :notes:

tone.