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

show.

wash :soap:

hash.

Shah :saudi_arabia:

Shaq.

hasp.

spam!

maps :globe_with_meridians:

same.

east :arrow_right:

tape .

vape :thought_balloon:

pave :brick:

vane.

anew.

wane :waning_crescent_moon:

bane.

bake.

beak :duck:

able.