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

town :houses:

down :arrow_down:

wont.

snow :snowflake:

Snot :nose:t2:

Scot :golf:

spot :dog:

post :mailbox:

Lost :palm_tree:

salt :diamond_shape_with_a_dot_inside:

slat
(no applicable smilie found)

last :zimbabwe:

fast :dash:

soft :snowman:

fort :european_castle:

frog :frog:

Gorp :peanuts::grapes:&c

Pogo :smiley:

Pool :swimming_woman:

loot :mermaid: