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

bass

buss

subs

sibs

bibs

Bibb

a county in Georgia

Gibb

vibe

gibe

You changed 2 letters, Ignatz.
Gobi

Bogy

bogs

bags

gasp

oops

I mean

page

gape

Peas

Pisa

Lisa

isle